Our system is also big on long grueling sessions with few breaks.
Clif Shot Bloks are my first choice, they let you chew, but disappear in your stomach & get quickly into your system so you can train & still feel light. Bites of Lara Bars in Banana Bread or Cherry Pie are also good, neither flavor is too sweet.
Have the packages already opened & sitting there so you can just grab one Blok or one bite of a bar & wash it down with a swallow of the drink you were already about to take. Teensy bits of nourishment frequently should keep you from getting sick.
Have also had good luck with Surge Workout Fuel.