RIMMEL EXAGGERATE BLACK WATERPROOF LINER
I just really like this one. It is sort of a staple, because I always come back to it, like I said, even after trying the more expensive or luxury brands. It stays on ALL DAY and even while I sleep. The black has a lot of depth, and all I need is one swipe. For some, I think this liner would be a little "hard" (as hard as a liner like this could be), but it's fine for my waterline. It is also very easy to smudge, and make looks a little messy if you want. But it does dry quickly.
So yes, for day one of the 30 days of beauty, here is my favorite eyeliner :]