In a large bowl, mix together sugar, brown sugar, & cinnamon, Set aside. In a separate bowl, whisk together the egg white with the vanilla extract until it becomes a little bit frothy.
Pour the pecans into the bottom of your crockpot, & drizzle with the egg white mixture. Using a fork, stir it all together to evenly coat the pecans. Sprinkle the cinnamon sugar mixture over top & stir with a fork until all the nuts are evenly coated with sugar.
Cook on low for 3 hours. Stir every 20 minutes with a fork. When 20 minutes are left on the cook time, pour in the 1/4 cup of water & give it a good stir.
Once the cooking time is up, spread the nuts out on a cookie sheet to cool for 20 minutes before storing.