I would imagine it could go either way, so I would say it’s up to you or the practitioner
I really like giving it the earth & making a new bottle, but I can also see charging it under each full moon too 
Personally, I’ve never had more than 1 bottle, but I use it when different things call for water or as an offering. So I make more than 1 bottle in a year. I charge what I do have under each full moon & then make more. I also charge each one with a ~Clear Quartz~:gem:, so the bottle has one in there already.
I also have the same stone in my stormwater that I use mostly as an offering for the Morrigan