Maybe just say, the gas bill was $60 dollars for today, everyone who rode can split the cost. I don't think people just riding in the boat should pay for gas. As far as food and drink, split it with everyone or have people bring stuff to contribute. If people aren't willing to pitch in, don't invite them back. As far as whether or not its fair, I would love to be able to go out on the boat for a day, food and drink provided for only $10!
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