Today's nugget is about PURIFYING MASK, but can just as easily apply to any other preservative-free dry mask that is reconstituted with liquid.
If you've accidentally poured too much water and find your mask a little too runny for your liking (which happens to all of us), just let your mask sit undisturbed in the bowl for a few minutes. The clay will absorb some of the liquid and your mask will thicken up to a consistency more to your liking.
If I'm not careful I will sometimes have to wait 10-15 minutes (sometimes even longer) but rather than adding more Purifying Mask, which would be more than I needed and wasteful, I wait it out.