I suggest you give the Gatorade I try - dilute it with water or pack your bottle with ice. Take another bottle filled with just water. If there are protein or salt foods you know you can stomach well, take a few along (I favor mixed nuts, almonds, Salted Nut Rolls, dried apricots, figs, crunchy peanut butter 1/2 sandwiches, and Gu). However, as this ride is supported with rest stops, you will probably find all the food you need there, but it would not hurt to carry one or two things you know you can stomach, just in case.

The first few MS-150 rides I did, I actually GAINED weight because I didn't pace my eating correctly at the rest stops. Good luck and have fun!