Everybody have been drinking a lot to cope, for me the best refreshers are two all-natural solutions:
coconut milk (nothing added, drink cold, slowly)
our former gongfu instructor's homemade sports drink, I make it with our 'standard-size' bottled water, for 1.5 liters you'll need:
Juice of 2 lemons
2 tablespoons of sugar (I use cane).
2 coffee spoons of salt.
when I make it I pour some water in a glass before adding the other ingredients and then top the bottle as needed.
NOTE: if you use sparkling water pour about half in a carafe before adding the juice and the sugar in the bottle, otherwise you'll get a white-water eruption.