I think, given the change to the water system, that the water purifier mod should maybe be removed. Me and a buddy just stood there and passed it between each other to drink from streams in the desert biome. I think glass jars in A19 and A20 made it redundant as water was so easy to get, but in A21 where water is supposed to be scarcer this completely removes any difficulty whatsoever as you can just scoop water by hand. Even if you want the space in your helmet for another mod, just keep the water purifier in your bike or backpack and swap it in when you need to. 100 points of over-hydration is absolutely no problem.