I thought I was going to have to set up an alien containment and research room to study the creatures to finish the game. Unfortunately, that was not needed.
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I just did a Hardcore run and I didn't need any fish. All I needed was 1 Bulbo Tree in my Base, and one in my Sub. Combined with the Nutrient packs from Aurora, a water filtration system and an actual 'farm' was not needed.
I wish that there was a mod that slowed down grow times by a factor of 10 or so and/or reduced how much water you can get out of Bulbous Trees. Or maybe require all indoor plants to require 1 bottle of water to plant. As is, the water purifier …