A generic offering ritual for the benefit of all spirits.  First mentioned in this 2012 post, then reviewed and renewed in this 2019 post.

For this ritual, you will need a simple cup of clean, fresh water and either one stick or three sticks of some generally-pleasing incense.  The water should be left unmixed with anything, though may be sweetened with a drop of honey or rosewater if truly desired; the cup itself is best one dedicated to spiritual work, and better dedicated solely for this specific kind of general offering, but this is not necessary so long as it’s been cleaned and cleansed after each use.  For incense, frankincense is always a good option, but scents like sandalwood, benzoin, sweet or mild musk, jasmine, rose, amber, and the like are also plenty fine; avoid anything too strong, potent, sharp, bitter, or sour.  Blended incenses are perfect, so long as they’re pleasantly fragrant enough without being overpowering.  You don’t need to use sticks, although I find them convenient; if you prefer to go with loose incense, feel free.  Although I like having a candle burning during all my prayers and spiritual work, with an exorcism and/or blessing said over it, it’s not necessary for this offering, as it’s not something being offered to the spirits themselves, although you may find it helpful just in case.  Other offerings, such as food, flowers, candles, and the like may also be set out, but those are entirely extra and unnecessary.  In this case, it’s better to keep the offering simple, short, and clean.

Ideally, this offering would take place in a neutral area, such as an outdoors place not on your own property, or in a place that is not otherwise bounded by spiritual protections belonging to some specific person or ruling entity.  Ideal places for this would be a park, field, crossroads, beach, or some other place that cannot be said to belong to anyone.  It is inadvisable to perform this offering in a place that is controlled by someone else, such as a sacred precinct, church, a place known to be claimed by a particular divinity or spirit, or someone else’s property.  Otherwise, it may be performed in your own home or on your own property, though you may need to ward and protect yourself accordingly to permit the offering to pass from the property without allowing anything baneful to enter in by the same way.  Depending on how you feel afterwards, you may want to follow up this offering with banishing to make sure nothing sticks around that shouldn’t.

When ready, wash your hands, set the cup of water and the incense out on a clean surface, whether on the ground or on a low table or other elevated surface.  Light the incense and let it begin rising through the air.  Hold your arms out, palms upward and out as in the orans gesture and recite the prayer aloud to the spirits:

Hear me, all you spirits, by whatever name you take, by whatever form you take!
Hear me, all you spirits, before, behind, beside, below, or above me who call you!
Hear me, all you spirits, of the north and the south, of the east and the west!
Hear me, all you spirits, within or above the Heavens, upon or under the Earth!
Hear me, all you spirits, with whom I hold favor or disfavor!
Hear me, all you spirits, who owe me debt or to whom I owe debt!
Here do I call to you, wherever you may be: partake of this my offering!
I dedicate to you now this water and this incense as offerings to you;
I give you these offerings freely and joyfully, and ask that you accept them in the same,
as symbols of my thanks, love, goodwill, honor, respect, trust, and joy for you
for your own benefit and peace, that I too might have benefit and peace.

Dip your fingers of your dominant hand (or the hand you prefer to use to give offerings with) into the water and scatter it around you to your front, back, and either side.  Visualize the water to rise up and flow out from the cup outwards as a constant fountain, especially through and beyond the spiritual boundaries of your own property if it is done there.  Resume the orans gesture, then recite the next part of the prayer:

Accept now this water, fresh, clean, and sweet,
that it may refresh you, cleanse you, and cheer you.
Let this water nourish you how it you need it best,
whether as golden rivers of nectar or as boiling seas of blood.
Let this water swell and surround you and the common ground we share,
that we may understand and console each other, comfort and soothe each other.
Let this water overflow this vessel and wash over all that exists,
reaching the uttermost shores of the cosmos in all directions,
that all spirits may partake of this my offering.

With the same hand as before, place it palm-down in the incense smoke, then lift your hand in one swift motion to draw the smoke upwards, then fan it away from you with the same hand seven times.  Visualize the incense to rise up and fill the entire cosmos with its plumes of pure fragrant smoke, especially through and beyond the spiritual boundaries of your own property if it is done there.  Resume the orans gesture, then recite the next part of the prayer:

Accept now this incense, sacred, whole, and pure,
that it may satisfy you, strengthen you, and fortify you.
Receive this incense as you how you need it best,
whether as abundant forests of fruits or as burning mountains of flesh.
Let this incense rise up and fill your beings, your hearts, and your minds,
that we may understand and know each other, hear and see each other.
Let this incense be compounded upon itself a myriad myriad times,
rising up and filling the entire cosmos with its sweet smoke,
that all spirits may partake of this my offering.

Maintain the orans gesture and conclude the prayer:

If I hold favor with you, then let this offering strengthen us and be a mark of alliance and friendship.
If I hold disfavor with you, then let this offering reconcile us and be an expression of apology to you.
If you owe me debt, then let this offering be a symbol of my faith and trust in you.
If I owe you debt, then let this offering be repayment towards its ultimate fulfillment.
Come and take your fill of these offerings, of this water and of this incense!
As you take your fill of these offerings, remember me who gives them to you!
Let this offering aid you in your work; let this offering sate you and please you!
Let this offering of goodwill be taken in goodwill, of peace in peace, of love in love
for your own benefit and peace, that I too might have benefit and peace.
If you came here to me in peace, so now return to your home in peace;
if you reside peacefully with me, so too abide peacefully with me.
Take your fill of this offering and continue in your work,
in the Holy Light of the Creator of us all.

Let the incense burn out completely; you can enter into a period of contemplation or chanting other prayers, if you want to be present for the rest of the offering, or you may take a brief leave and return later.  Once the incense burns out, the offering may be formally drawn to a close. If possible, scatter the incense ash into the wind and pour out the water onto the ground; if done indoors, these may be disposed of in a trash bin and a sink respectfully.  Resume the orans gesture, then recite the next part of the prayer:

The water I poured for you is drained, the incense I burned for you is spent.
The offering I made for you is given, the offering I made for you is complete.
May this offering be pleasing and fit for all spirits where they are,
that they may be at peace, and be at peace with me.
May no ill-will remain, may no malice remain,
but only peace and peace and peace and peace.
All you spirits who have come to me to partake in this offering,
as you have come in peace, so now go in peace.
Go now with my peace, go now with my blessing, and go now to your work,
in the Holy Light of the Creator of us all.

The offering is complete.