Using just SA 2.1.9 & fluid-nutrients 2.1.1, I can't start the game because of an Error while running setup for recipe prototype "nutrients-from-spoilage" (recipe): Recipe has 'crafting' category but has a non-item product 'nutrient-solution' (fluid). Even resetting the mod settings doesn't fix the issue.

I'd imagine that you'd need to use the "advanced-crafting" or "crafting-with-fluid" (I'm not sure) category instead.

Using just SA 2.1.9 & fluid-nutrients 2.1.1, I can't start the game because of an Error while running setup for recipe prototype "nutrients-from-spoilage" (recipe): Recipe has 'crafting' category but has a non-item product 'nutrient-solution' (fluid). Even resetting the mod settings doesn't fix the issue.

I'd imagine that you'd need to change it to the "advanced-crafting" or "crafting-with-fluid" (I'm not sure) category instead.

Fixed in latest release.
Slipped past testing as recipe category conversion was mistakenly happening only when the water required for nutrient solution mod setting was enabled.