Smart Water is good too. It is electrolyte-enhanced water and a bit easier on a super tender tummy than Gatorade. Pedialyte helps, too.
I hope you feel better soon.
PS - On the subject of Taco Bell, does anyone remember Mexi Fries? They were basically spicy tater tots. They served them in WA and IIRC, Cali. I tried to order them once on the east coast and the lady at the counter had never heard of them.