Actually I can help a bit on the fueling part.....only difference is that mine is cycling.
For me and my kid, we always cramp our back pockets with full of snacks, various stuff but usually is the harder stuff and it includes dry stuff like Oreos, needing water intake if not really choking feeling.
No scientific basis or timings like every 20-30 mins or what, but we eat very often. The idea is to make it like muscle memory for the stomac, rinse and repeat and rinse and repeat, even shorter workouts also make it a point to take something. If wanna practice the consistency aspect, can try melted chocolate + a bit of water. (body heat would melt it).
When doing longer routes like LCK/Neo Tiew, i even pack my $2 sandwich....2 breads, tuna and mayo inside, i buy 1 day beforehand from bakery. Stop at bus stop, makan.
With my kid, we even could take 1 full bowl of bak chor mee/fishball, makan, then hoot after that. Or like yesterday, 1 full bowl of $4 porridge (ming kee porridge at West Coast Market) and stomach full of porridge then continue journey liao, no rest. But note, this is only lower intensities like zone 2 for my kid, who also dont puke/have GI issues despite having nearly full stomach full of food. We are talking about 80-100km of mileage for the kid on a foldie.
Over time, the fuel intake is of a higher importance than GI issues, the body learns one, make your body learn it this hard way.

I find that over time, your stomach really learns and compensates.....
Like just now, i was doing my short workout (ard 45 mins of intervals only) and i just had 3 of Duplo bars......simply coz i dont do pre workout BF one lah Totally no issue nowadays, unless if you going very very hard.