Question:)

You can track soda just like any other food. There should be entries in the database corresponding to the specific kind(s) of soda you drink.
If you don't want your soda consumption added alongside the food you consume, you can customize your meals and create a separate meal called "soda".

You would track it as though it is food. It doesn't really matter where you put it, as far as breakfast, lunch, snacks, etc. The only thing tracked as being liquid consumed, is water intake.