What’s that Weird Liquid Floating on Top of my Starter?! Don’t be alarmed when you see this. Runny liquid floating on the surface of your sourdough starter is perfectly normal, and actually shows that your starter is feeding well!
If you see hooch on top of your starter, you can simply stir it straight into the starter, and feed your starter the way you normally would. There is no need to drain the hooch out.