Don't worry about trying energy drinks. You need to experiment with them to determine which ones you can tolerate. I found out on a ride that Gatorade just makes me sick, I struggled to finish the ride. I use Accelerade because it has a 4 to 1 ratio of carbs to proteins.

Since the ride starts at noon eat a good breakfast and lunch (if you can) and a good dinner tonight. I always carry a Cliff bar, and a peanut butter sandwich if I think I'm going to get hungry. Hydrate well tonight and in the morning, also eat at the sag stops, fruit, nuts, etc.

Since you're a slower rider would it be ok to start earlier than the recommended 46 mile time? That way you can finish the ride and won't be one of the last ones out. Don't linger too long at the sag stops and don't feel that you need to stop if you're feeling ok. I sometimes skip the first stop unless I need the bathroom, which I usually do early in the morning.

Energy drinks need to be mixed at the recommendation of the manufacturer. Under diluting diminshes the benefits you get from the drinks. I've seen people put "little tiny bits of powder" in their water bottles thinking they're getting a boost but all they have is flavored water.

Have fun, I toured in the Duluth area this summer. Are you riding the bike trail that goes north? along bike Superior?