The water quantity is unclear. How much water?

Here’s what it says now: “1 cup tepid water, plus more as needed as needed.” Looks like the typo was (mostly) corrected.

It's probably just an error and is meant to be 1 cup of tepid water. There are lots of errors in online food recipes all over the Internet and sadly Food52 is no exception.

In any case, just make the pasta dough to the right consistency: not too wet and sticky, not too dry as the recipe author describes.