I agree that food or at least electrolytes are needed. I have several digestive issues (I had been diagnosed with Crohn's, though I don't think that's quite accurate), and had to try quite a few things before I found what works best for me.

I try to eat a small amount at least two hours before riding - quick carbs like potatoes and some protein. Any ride that is over one hour, I will bring more than just water and usually a fuel, also.

For more than water, I don't much like gatorade or other drinks, I'm more likely to just add electrolyte drops to my water. They don't have any flavour, so you can't tell they are there.

For fuel, I like Cliff Shot Blox the best. They are made from brown rice syrup which makes them easier on my system. 2 blocks are usually plenty enough on a 1 1/2 hour ride, at 2 hours, I'll usually have 4 blocks.

And after I try to eat something with a fair amount of protein and quick carbs to help my muscles recover. I don't much like protein shakes and other liquid food, so I try to have my favourite: quick baked potato with some chunks of ham/meat, a few chopped veggies and some melted cheese. yummy

You have to find what works best for you. Good luck! And congratulations on your long bike rides!

Hugs and butterflies,
~T~