Lemon is one of the most alkalizing foods. Even though it's classified as an acidic food, once it has been digested and assimilated by your body, it has an alkalizing effect on you, which is helpful if you're trying to bring down the acidity of your body. It's also one of the best foods to aid in detoxifying your body.
I've got into the habit of squeezing half a lemon worth of juice into almost every of the several glasses of water I drink every day. I now enjoy the taste of this lemon water. :)
Even if you don't wish to drink it all through out the day, it's good to start off your day with a glass of lemon water before breakfast, since it helps your body, including your liver, to flush out toxins.