When lining your inner rim (water line) do one of two things to make it last longer:
1. Use an eyeliner brush to apply powder to your inner rim to help dry the area, then use your eye pencil to line. The powder allows the pencil to apply and stay on better.
2. Use a water resistent gel liner on your inner rim. I find that these stay in place all day or evening. MAC and Bobbi Brown have amazing gel liners!
MAC Fluidline Eye Liner Gel Blacktrack (Black)
Bobbi Brown Long-Wear Gel Eyeliner
My favorite Bobbi Brown color is Espresso (dark brown)