What spaceship fuel to use on Ceres?

For spaceships working on or near Ceres, what would be the best option for locally produced fuels?

Let's assume that there's plenty of water ice available, and other chemicals as long as its plausibly realistic. There is lots of electricity due to fusion reactors on the surface. Spaceships use batteries, fuel cells, and present-day tech [more or less]. Is there one particular fuel which would be dominant due to it being cheap, effective, easy to handle, and easy to produce?

The goal is for short trips, for example, a surface to orbit, then plane change to another orbit, then back to the surface again with some delta-v to spare, for a craft with a mass of around 3000kg. Would this fuel source be used for both an RCS and main engine, or just one of them?

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What spaceship fuel to use on Ceres?

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