Yep, I usually get "fruit punch" (sorta red) for Gatorade.....so I don't mix bottles.....BTW, earlier Gatorade had a "wide mouth" top, also a full US quart, not the new smaller capacity.....easier to "refill"....good for long road trips as well...
Quart sized+ ziplock baggies were also useful.....never tried external catheter or similar...