Oatmeal has a high fat content, which helps keep Lecomte full while he swims in the 78-degree waters of the Pacific.
Before he gets in the water, he answers a few emails, does a bit of writing, rubs Vaseline on his skin to prevent chafing, and may work on some necessary repairs of his gear.
Then he and a crew of two others get in a rubber dinghy and head back to the precise spot where he stopped swimming the day before. (They monitor Lecomte's progress using a GPS tracker.) The crew members point him in the correct direction, and he plops into the water.