How do you change you betas water?

to change your betas water, you have to prepare water 24 hours before. you fill up a gallon of water and put a thing called Prime. Then you shake it up. in 24 hours, take the beta out of the bowl or whatever it is in. Usually i put mine in a cup. rinse the old water out and rinse the bowl or whatever it is. Pour the new water in and you have a clean bowl or whatever.