To quickly juice a few oranges or lemons, use the beater from a hand mixer. Cut the fruit in half, hold it over a bowl and twist the beater as you push it into the fruit.
If you have a difficult time adding just the right amount of water when making pie crusts, try using a sippy cup (you can usually find them at dollar stores).
Here's a tip that lets you pack sliced apples in lunches, without them turning brown.