Kudos on your desire to break the mold! Good for you.
+1 on hand-up’s for the first wave of “fast(er)” riders. Nice idea, but quite possibly a wee bit dangerous for helpers and riders.
Alternatively, have enough helpers at your station so riders don’t have to get off their bikes, park them and then stagger over to get in line for food and water… someone grabs their bottles and fills them how they want while someone else brings over the food platter.
If you’re near the end, consider offering ice cold mini Coke cans. Say no more! Or, stretch it by serving it in tiny cups like airlines.
If it’s hot out, offer “disposable” cold water hand towels so riders can wipe their face, neck, hands, etc. Keep the hand towels in a big cooler filled with ice water… hard to know what to do with the used towels, but they shouldn’t be recycled during the ride! Suppose you could cut the towels in half to double your available inventory. They’re not too expensive in bulk on Amazon.