Practice putting in and taking out your lenses before the trip. If you're used to using a mirror, you'll need to practice until you can remove them by feel, even in the dark. This will help you during late nights in tents and any situations where there isn't a real bathroom available.
Get a secure contact lens case and solution bottle. In order to keep from leaking solution or losing lenses, make sure that both the lens case and bottle close with screw-on caps, rather than snap-ons, which can easily be pulled open or leak.
Pack a kit with finger-cleaning supplies. This will ensure that you don't damage your eyes or lenses as a result of dirt on your hands. Bring some packaged wet wipes with disinfectant to clean and sanitize your fingers, then rinse them with drinking water to keep the chemicals in the wet wipes from your eyes.
Store your lenses in your shoe while sleeping. This will protect the lens case and ensure that you can easily find the lenses in the morning. If you switch to glasses before bedtime, keep your glasses here, as well.
Wear long-wear lenses, which are designed to be worn continuously for up to seven days, even while sleeping. Be aware, however, that many eye doctors consider these types of lenses to be potentially risky.