Urine
Urine can be one of three colours. Dark yellow, bright yellow, or clear. It can also be brown, but that's bad news because that means that you're bleeding down there. You should see a doctor about that. If your urine is dark yellow, that means that you are dehydrated, You should drink some water. Water is best. It is, after all, what you need. Anything that isn't just water will have other things in it that your body may or may not need. Some of those things, like caffeine, can dehydrate you even more. Don't drink stuff with caffeine in it when you're dehydrated. Drink water. Water is best. Your hydration level is shown by how dark your urine is. The more dehydrated you are, the darker your urine. As you drink more water, the colour of your urine gets lighter, until when you are fully hydrated your urine is clear. If you continue to drink water after this point, you may become overhydrated. This means that you pee. A lot. Your bladder will just keep refilling