Hi @ArcticCharm! I also have no bathtub 
We have a stand up shower 
with a seat.
A couple of things you can do, depending on the cleanse, ritual, spell, meditation 
etc…
- If you have small mesh bags… place the herb(s) in there.
- Hang the bag from the shower head
- Place the bag in the bottom of the shower where the water will hit it
- Make up the herb mixture in a small pot on the stove. Strain the water into a bowl & use a small cup or the bowl to pour the water over yourself after you’ve finished showering. The herbs can go into the mesh bag & in the shower with you.
- If its an herb
or plants such as Eucalyptus, hang a branch or piece of it from the shower head or where the steam will get to it - Place candles &/or incense in holders on a surface safe to do so like the back of the toilet, around your sink.
- Place crystals by the candles/incense
- Crystals that won’t be damaged by water can also be placed in mesh bags with or without the herbs
- Use a bluetooth speaker, your phone, laptop, etc… for the sound or to listen to the guided meditation
→ Ritual Baths without a bath?
→ Bath Improvisation
→ Weekly Witchy CHALLENGE - Scrub-a-dub, Magick in the Tub!
These may also have some ideas for you as well!