Originally Posted by
Wulf202
Flat water is still water, i've drank 3 year old water without problems and the storage conditions for it were anything but ideal
Keeping them separate has several advantages, you can change out flat water and not loose the money on the electrolytes, if you have a puncture you don't have a sticky mess, you would have a hard time washing an eye/wound out with gatoraide, if your giving aid to a stranded person and they are diabetic it could do harm, adding a sugary solution to your radiator/battery will cause problems if you have a vehicle emergency.
Water bottles will sweat so keep that in mind with where you put them otherwise you wind up with moldy blankets.