Hey, I'm pleased my suggestion is working for you.
I find salty snacks appear to make a difference; I tend not to add salt to my food and on occasions when feeling exhausted, a packet of Salt flavoured Crisps (UK equivlent to Pringles) helps, although my Doctor dismisses this, suggesting it's more likely a sugar rush.
I've found I can actually be hydrated to the extent that my urine is clear, yet I'm still lacking the essential electrolytes; it's possible to drink so much fluids, far less than we realise, that the electrolytes can become diluted; some fit and healthy Marathon runners have colasped during a race and died from such a condition.
Rather than buy ready made electrolyte supplements or drops; I make my own rehydration solution, which was provided by St Marks Hospital, they call it the St Marks e-mix solution, it's cost a lot less than ready made suppliments; I posted the recipe within my second reply to this thread.