can't remember how much sodium is in the High-5 ones, that would be the main concern if you upset sodium balance, you may end up pi$$ing out what you're putting in.
I think the rest of what they have is a bit of magnesium, potassium, can't remember the rest.
What is your current blood glucose? Long term control of that will be the key, as you're probably aware and will reduce that thirst. I went from downing consecutive pints of water, tea, coffee, beer, gin to just normal thirst almost overnight.