making enemas?

am running out of the several cases of enemas that i bought on ebay a while ago. i got a good deal on them as some of them had damaged boxes.

but i’m aware that this is not very sustainable. all the plastic containers and cardboard packaging for what amounts to a small amount of water with sodium phosphate salt mixed in.

so now i’m looking at buying a bulk quantity of usp-grade sodium phosphate and mixing my own enemas.

what sort of water can i use? common sense tells me that if the water is good for my other end, i.e. for drinking, then it will also be good for the enema-end. for me that means reverse-osmosis filtered water which i may take the extra step of also boiling prior to making the solution.

so i guess now all i need to do is break out some basic chemistry computation/math and figure out exactly how much sodium phosphate u.s.p. it takes to mix with X amount of H2O.

well it says on the ingredients on the packaging exactly how much sodium phosphate is used:

Active Ingredients
(in each 118 mL delivered dose)

Monobasic Sodium Phosphate Monohydrate, 19 g
Dibasic Sodium Phosphate Heptahydrate, 7 g

hmmm. i’m seeing dihydrate available and will have to figure out what is the difference between all these different versions.