Originally Posted by mr_pedro

Regarding nutrition, you can just eat normally before the ride, the question becomes what to eat during the ride.

It depends a lot on how fast you are going relative to your limit. For very hard rides, you need to eat lots of sugars during the ride to sustain that intensity for longer periods. If you go just a bit slower you can do with much less sugars as you are relying more on fat, which primarily comes from what is already in storage.

This is something that you can figure out as you slowly increase the length of your training rides. You can take for example two bottles with you, one bottle with regular water and in the other bottle you do water with 100g of table sugar, 1-2 g of salt and 1g of citric acid or enough lemon juice to make it palatable. During the ride you can alternate between the 2 bottles depending on if you need energy or just water. If you need more sugars you can then pack some bars or gels, but just this one bottle will probably take you a long way.