I think Gatorade is full of sugar - as much as he's craving it, I don't think he'll break down and drink it, just because his sugars have been out of control for weeks and he's only just getting them back down to a safer level. But he's going to look into the Propel (made by Gatorade but with a lot less sugar).

He's actually decided to go into emergency tomorrow to get rehydrated through IV. They might suggest doing the IV thing on a regular basis since he's having such difficulty drinking enough (he has dry mouth from the chemo which gives him an unquenchable thirst and cold sores [from the chemo] in his mouth which make it painful to drink.)

BTW, he was interested in the diet root beer and the flavoured iced teas, so I'll look for those tomorrow for him.