Step 1: Ingredients/tools
--1c sugar (or less)
--small piece of ginger root
--a grater (microplane or fine holes) or food processor/chopper
--an empty 2L plastic (important) bottle
--around 2L of fresh water
Step 2: Ginger root preparation
Step 3: Squeeze lemon
Step 4: Put ingredients in bottle
--1c sugar (Again, taste comes into play. I like it less sweet, so I add ~ 3/4c. You may wish to add more or less depending on your personal taste. Add a full cup the first time you make it, and go from there).
--1/4 tsp yeast
If you're having difficulty with the sugar and juice, make a funnel out of a paper plate to pour everything in. Once everything's together, shake it around a little to distribute things.
If you're really paranoid about germs, you could prepare a weak bleach solution and rinse everything with it, but I don't see the point since you'll likely drink this before anything goes wrong. Just be sure to wash your hands before you touch stuff and you'll be fine (nothing adds tang like Clostridium!).