As you may figure out from my username, I eat a carnivore way of life (only meat/chicken/fish/pork/seafood/etc). No vegetables, fruit, breads, starches, carbs, etc. It works for me. It may/may not work for you. If you’d like to consider this way of eating, head over to https://www.reddit.com/r/carnivore. If you’d like to argue about it, head over to How to stop being scared of sugar? - #12 by Foodpedaling.
Anyways, I have just discovered Fizz tablets last week (Endurolytes Fizz - Effervescent Electrolyte Replenishment | Hammer Nutrition). They’re low/zero carbs. I’ve been drinking that for just a couple days now during rides. For rides over 4 hours where I want solid food, I’ll eat some sort of beef jerky/sticks. This works for me.