[Suicide Junkie]

Ships in a fleet will share supplies, so if you were to build one with a bunch of supply storage bays, it would make an excellent rescue/refueling ship.

You will also want to build resupply depots (facilities) on your planets. They automatically refuel any ship which passes through that sector of space. Your ship dosen't even have to stop for a turn! You've got one at your homeworld, which is why the ship went there to resupply.