Since there will be EIGHT, EIGHT, EEEEIGGGGHHHHT (8) inaccessible-to-crew aid stations at the 100, with no drop drop bags either, I decided to get effing serious and purchased a Nathan pack that is rivaled by no other.
This sucker holds 100 ounces of fluids and has more pockets than Grandpa Joe's overalls (I have no Grandpa Joe, nor does anyone in my family farm). AND, get this, it has a separate reservoir for energy drink/electrolyte drink. Show 'em, Vanna:
That little orange dial actually allows you to switch back and forth from water to mixed drink, OR, you can combine the two.
I seriously have the biggest nerd smile on my face right now.