I can attest that the J30 has a great ice box. Madcap has done 3 Macs (2 solo and one double-handed) and a Hook. I usually leave the dock with one big clear block of ice and a couple bags, and finish with ice to spare.
I agree warm meals are key. My alcohol stove has pot clamps that came with the boat.
No need for dry ice though I have used it many times in Macs on other boats. Just be careful what you put next to it. Ive seen hardboiled eggs turn into ping pong balls
