I can make this dive, I'll be up for two dives. I just got a HP 130 tank for longer shallow dives or more safety cushion on deeper dives, need to break it in.
I'll bring ketchup, mustard, relish, onion and chips.
And I'll also bring hot water, and packets of hot chocolate and cider. It doesn't seem like a big crowd. I have two of those 12 cup thermal carafes. I can fill one with just hot water and the other with coffee if there are coffee drinkers. Any coffee dinkers let me know.
And I was in Cozumel for a week just a few weeks ago, in between the first and second dive they pulled out a cooler with juice, fruit and each day a different kind of nut bread. It was a pleasant in-between dives habit so I'll also bring some kind of nut bread for in-between the 1st and 2nd dives. There may have also been something about the 80' viz and tons of fish that made those dives pleasant, but I can't bring that.