Water intake is very dependent on heat.
If it's in the upper 90s to low 100s I can drink 48 to 62 oz. per hour and still lose water weight.
If it's in the 50s or 60s 24 oz can last two hours.
I need to start eating at 2 hours. Up till then I guess I burn glycogen. If I try to go 3 hours without eating I will bonk.
I'm kind of old fashioned. I like bananas, fig newtons and plain water till I get bonky. Then I'll try to find a convenience store and buy some gatorade and honey buns.