Posca an ancient energy drink that is easy to make and helps you beat the heat the same way it worked for Roman Legionnaires more than 2,000 years ago. One of my carpenters swore by this drink of Posca to avoid dehydration and heat prostration while working on hotel projects for me in the tropics. I've tried it and it is quite good, not as syrupy sweet as Gatorade but just as effective.
I'm going to make some just to see how it tastes.
[romanobritain.org]
I've made it and it benefits from some extra honey and salt but not too much, according to taste so start more sour and then increase the sweetener.