Rehydration Drink Startup

Hi all,

A slightly off-topic post, I have a friend who has a startup drinks company in the USA that is producing rehydration powder and has asked me if I can help him understand more of the industry and the viability of his endeavor.

Do you have any experience in this industry and would be willing to chat to him?
Do you have any resources to point him to?
Any advice?

I appreciate your time.

Dave