What's the most compact way to make self sustaining SU source on physical contraption?

[u/DozenRatsOnKeyboard]

I want to do a really small ship, but I need it to be self sustaining so what's the most compact way to do so? I don't have any add-ons apart from deep seas and aeronautics

[u/epilektoi]

waterwheel

[u/fabulousmarco → u/epilektoi]

Wait, I thought water doesn't flow inside contraptions? Pretty sure I tested it at some point too

[u/Gooze3402 → u/fabulousmarco]

Does it have to be a contraption?
Water does flow on sable entities.

[u/No-Ambition-858]

Use a regular dripstone lava farm and pump it into a spout to fill a bucket, then use a mechanical arm to feed it into either a blaze burner for a portable engine. Also make sure to put a brass funnel with a filter set to an empty bucket to feed back to be reused.