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On Bonking. It is purely physiological.

Muscles build up glycogen. That is their fuel. You have about 2 hours of glycogen. If you keep exercising (like long distance cycling), you will fully deplete the glycogen. Your muscles still need fuel, so they start pulling glucose from your blood stream. You end up with low blood sugar.

The fix is easy, eat before you are hungry. And the closer to glucose, the better. JAT Juice is a dextrose based sports drink (~200 K-calories per bottle). It will support more riding. BUT, with even further rides, you will need even more calories. JAT Fuel. JAT fuel is around 100Kcal per oz.

For the MS 150, I would "schedule" about 4000 calories between the JAT Juice and JAT Fuel. Yes, you can use shot blocks, gels, etc. They all do the same thing. But it takes times to digest. Start BEFORE you get on the bike.

Do not worry about vitamins. DO worry about electrolytes. Gatorade and the rest have reduced the sodium/potassium levels, since so many people are drinking sports drinks, like, well, water. (Drink Brawndo - "It has electrolytes!"). I have a bicycling sports medicine book which I used as a guide to make these supplements.

I doubt you will need 4000 calories. But you will need 2-3K each day on the MS150. And Mrs. Masraum will need 1K-2K.

Fluids - It depends on the temperature.

60F or less: 1 Bottle/20 miles
60-80F: 1 bottle/15 miles
80+: 1 bottle/10 miles

Your needs will be different. Start looking at the temp at ride time. Weigh yourself. YES, and MRS. Masraum. Check your weight after the ride. The different is how much water you lost. You should increase your consumption by that much at that temperature. That said, there is a maximum amount of fluid you can process per hour.