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Use generator.
Talos > Dam > Satori (possible after learning Talos > Larion > Dam > Satori).

Satori > Astrape > Dam (grind Astrape - Dam back and forth).

So the shortcut is useless for now because by the time you can take it you have finished the game.

Install the generator at Talos. Head to Larion. Take a single power cell from the rover. Use the cell to power up Larion. Stock up on water bottles from the Rover Purifier inside of Larion, as well as Ration Packs. The single power cell will give you more than enough time to get 5. Make sure to turn off auto-use water bottles. While the water bottles are generating, go outside and pick up the fuel cells for the generator. Once you're fully stocked, return to Talos and stock up on water pouches and food items inside.

Now you turn on water bottles and turn off water pouches, then head to the dam. Pick up the water bottles and glacier samples from the crates. Unless this is your first time picking up the crates, it should be a net positive water accumulation, especially if you have unlocked the combined action for them. Then, just head straight to Astrape.

It might take a cycle or two to get to Astrape with this setup, but after a couple cycles, especially once you unlock the Dam>Astrape combined action, it's faster than stopping at Santorini instead.