Resupply Ship?

[Suicide Junkie]

I've made use of supply transports quite a bit in CBmod.

Simply design a ship that has a zillion supply tank components. Put on a set of solar panels if you have space, too. Refilling as it flies is great.

Send the ship to where it is needed, and fleet with the ships that are low/out of supply.
Supplies get shared evenly, so if you have a 8000/8000 supply tanker plus a 0/3000 cruiser and a 100/2500 battleship, the end result is:
Battleship: 2500/2500
Cruiser: 2800/3000
Tanker: 2800/8000

Then you send the tanker back to a resupply depot to grab more supplies, or park it in a trinary star system to soak up the rays.

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At high tech in stock, there is also the quantum reactor which gives your ship infinite supplies. When fleeted with other ships, they will all be filled up to max by the infinite sharing of supplies.
Note: Sharing only happens at the end of turn. Normal ships fleeted with a quantum reactor ship which use up all their supplies in combat will be dead in the water until the end of the turn.

Quantum reactors suck a lot of strategy out, and many mods remove them from the game.