If you want to take your makeup to the next level, then an eye pencil such as this is a good choice. One of the features with this eye pencil is that it's waterproof.
Waterproof Pencil - Chestnut
Amazon
Clarins Waterproof Eye Pencil Award-Winning Highly Pigmented and Long-Wearing Includes Retractable Tip, Built-In Sharpener and Smudger For Smoky Eye Looks 0.01 Ounces