I had a home birth with my daughter (my first) in February. I didn't have a water birth, though I did use a birth pool briefly (actually didn't like it, so got out and gave birth on our bedroom floor).
Here is a great website with lots of info and they have an awesome Facebook group as well: https://homebirthersandhopefuls.com/
Things I can't recommend enough just in planning for a natural birth: some sort of hypnotherapy practice (I did natal hypnotherapy) and a TENS machine was great too. That's all I used.
They have a list of things you need on the website above, but honestly other than a pool if you plan to use one, some floor coverings (cheap shower curtains and cheap Argos towels worked for me), and something to eat and drink (dates, honey, glucose gel, porridge and then coconut water and just plain water were what I had), you honestly don't need all that much. Of course, you'll want all the normal things you have for a baby (clothes, nappies, etc.) and for yourself (maternity pads, breast pads, bed pads). You might also find that a clean bucket is helpful for regulating water in the pool. And then some snacks for your partner and the midwives (tea, biscuits, whatever else you have in the cupboard) might be nice, but they will always bring their own food as well so you don't need to provide them with a meal. You probably have other things around the house you already need, like a dressing gown or a torch if it's nighttime and they need to have a look at things without flipping the lights on. Oh, and it's never a bad idea to make sure you have some floor cleaner (Vanish worked for us), just in case someone forgets to put your floor covering under you, which is what happened to me!
But honestly, other than the pool, floor coverings, TENS, and snacks, I don't know that I really needed to stock up on much that I didn't already have around the house or wouldn't be able to run out and get later (like the Vanish). You really don't need as much as you think you might. The midwives will bring all the really important supplies. The rest is just about relaxing and enjoying your birth! It really is such a great experience!