I bought several different types of bottles while I was trying buoy. I was assured that it was okay to mix different varieties of bottles throughout the day or on different days. I really didn't think it was working.
UNTIL...I stopped taking it. Every morning and was having dry mouth that just got worse and worse and worse after running out. Dry mouth during the night is really difficult to sleep with. Dry mouth during the day can be equally cumbersome.
To be clear, these were all dehydration issues I had before taking Bouy, and I still didn't really think about it and what it was doing for me for night time in the next day. I would drink electrolyte beverages in its place and they didn't do anything compared to Bouy.
I am about to get on a subscription deal. The customer service person was also helpful. Every different kind of these drops have hydration in them. I add drops to everything I drink.
I can honestly say I recommend it. The real test is taking it for a month and then stopping. Then you will know exactly how much good it's doing you.