Mortar is used to hold things like bricks together when you are building a house or other building. Mortar is made from sand mixed with cement or lime, and sets hard.
Water is the simplest thing you can drink, and is the best for you. All other drinks are just water with something else added to them. Your body is made up of more than half water, so if you don't drink enough you will dry out and become dehydrated.
