I haven't tried it, didn't know if you could use just mineral water for balance. I use no salt for potassium, I get enough salt usually in a day for sodium or I drink a cup of bone broth (Wal Mart now has it), and I use liquid magnesium at night. That kept me pretty balanced during the keto process last month. I did look back at my diary pre-keto and found I still wasn't balanced on my electrolytes, so not sure why they have to be so balanced during keto. But I do know I suffer a lot more leg cramps during keto than I did before, and the addition of the ketoade (the no salt, Mio and ice) has significantly stopped those.

Simple answer: no. You will find this out the hard way if you ignore the good advice you've received above and try to go without supplementing electrolytes like sodium, potassium, magnesium, calcium, etc. Just sayin'....(shrug)

Read this from our Stickies:

http://community.myfitnesspal.com/en/discussion/10358179/low-sodium-and-keto-flu-electrolyte-imbalance-may-be-your-problem#latest

Unless it contains 500+ mg sodium per serving, it wouldn't be. That's why understanding the total need and how over consuming water without sufficient sodium would actually make things worse is important.