If you are really afraid you are going to bonk from not getting the nutrition and hydration correct, then go to the bike store and buy a packet of Shot Blocks. Use your regular food and water and supplement with the Shot Blocks if you need to. I am more into getting most of the nutrition from real food, and no sports drinks. I used Accelerade for years and it just adds too many calories, hence the Nuun. Shot Blocks are pretty much pure sugar/gummy bear like things that I only need one of to make me feel better if I am lagging. You are supposed to eat 3 at a time. You chew it up as you drink water and it takes about a minute or two for me to feel better. I have used them when I have felt awful and they work.
For a 46 mile ride, I wouldn't need anything other than a good pre-ride meal and maybe one Luna Bar, unless it was very hot and/or hilly.