Not exactly what you're looking for, but Wake water has a couple powdered zero sugar electrolyte (and energy) drink mixes, and Roar has some low sugar berry lemonade hydration/antioxidant powders.

I have been in the market for a good water bottle/canteen/tumbler and these look like a great option! Thanks for sharing!

If it's the one at the Lawson mall its at the back and to the right from the entrance, behind the hair and stationary supplies, I think.