Mark 6:32

‘And they went away in the boat to a desert place apart.'

So taking ship the group sailed to an isolated place where they could be alone. Luke tells us that this was in the vicinity of Bethsaida Julias situated near the top of the lake to the East (Luke 9:10). It was necessary even for these young and exuberant men to have a vacation sometimes, not one of making merry, but of getting alone with God. And no doubt they took food with them which they may well have consumed on the boat.