I use Skratch Labs products. I suffer from terrible stomach distress if I try to drink all my carbs which led me to finding Skratch several years ago. Their Sport Hydration mix gives you what you need electrolyte wise with a few carbs. I then use their chews and bars for on the bike nutrition. I almost never preopen anything, I’ll drop to the back or pull off and ride no handed to open a wrapper. For me there is enough flavor options to not get flavor fatigue but for long rides I’ll make rice cakes, cookies or a few other things that don’t bloat me up.
Also check out the Feed Zone Portables cookbook for rice cake ideas.
When I was searching for a solution to my bloating problem years ago, Dr. Lim very serendipitously produced this video around the same time and it changed my on the bike hydration philosophy.