a glass without water is still a glass. yes. its empty. but it still has space to be filled in, isn't it? it doesn't perform its function, currently. but it still CAN perform its function as a glass, or else it won't be called a glass, isn't it? now you don't know how to pour the water in? now you start to be concern about that single glass you are having. now you start wondering, why do you need that glass? my advise- seek the glass' inventor.from there you will have to learn every single things about e glass. you may want to know:
1- how to keep the glass clean?
2- what temperature of water that is suitable for the glass?
3- how long can the glass keep the water at its suitable condition?
4- how, to not make it break?
only by asking, searching, you can get the answer. only by asking & searching from the right person, you can get the right answer.
the glass, is the heart. do you know who is the heart's inventor? if you do, then you know what to do.