The problem is no one in New York have cars, so cooler and such are out of the question.
Subway or biking is the way to get to races, the latter tends to be faster and more efficient.
Chocolate milk is hard to come by, specially races around here are at 6 am, finding a bodega is a scavenger hunt at that time. Plus milk makes mucus which is not fun while riding your bike. I mix the shake with water post race.
I’ll look into the ON gainer, and Ambers post.
Also another caveat is that everything needs to go in a small backpack, this is why shakes are easy on the go.