If your yogurt ends up watery, it could be because of a couple of reasons:
1. It may have separated. This recipe is naturally very thick, so this doesn't usually happen, but if it does, it's easy to fix. Simply strain it, pour off the liquid, or blend it.
2. It needs more time to ferment. Your keto yogurt mixture will be liquid when you first set it out, and will firm up as it ferments. If it's still very thin overall, you can continue to ferment for longer, or just use what you have in smoothies (try my low carb green smoothie bowl or add it to a strawberry avocado smoothie).