Recipe: Basic Ginger Beer

Here's a simple recipe for ginger beer, with no other flavour additives (I'm still experimenting with those).

Clean your bottles. I use two plastic 1-litre bottles that were originally for sparkling water. You can really use whatever size you want, as long as they're plastic.
Chop up the ginger in to small (half centimeter, or whatever you want) cubes
Place in a pot with 2 litres of boiling water, and boil for 30 minutes
While the water is boiling, mix some of your sugar with a cup of warm water, and sprinkle the yeast on top
After 30 minutes, strain the ginger out of the water (I didn't strain the one in the picture) and let it sit until tepid
Once the water is cool enough to not kill the yeast, add said yeasty water to the mix
Carefully pour into your pop bottle(s) and cap them tightly
Leave the bottles somewhere warmish in your house for 24 hours
The bottles will become rock hard from the pressure inside (which is why you don't use glass bottles)
After 24 hours, put them in the fridge
After 2-5 days, slowly open, and drink!

Open the bottles very slowly if you don't want a mess
The amount of sugar can be varied. 1 cup will end up being roughly the same amount of sugar that is in Coca-Cola, but it works with less
The amount of ginger can be varied too!
I usually make it on Wednesday or Thursday night, so it's ready for me to take to work and drink on Monday