water weight

Hello! 

So I am incredibly underweight and am trying to gain it back. I know many people post these types of things, but I was wondering how much of my weight is real and how much is water so far. I was 77 pounds two weeks ago. I worked my calories up to 1800 by adding about one hundred a week. After I reached 1800 I got hungry all the time and started adding 100 calories every two day. Once I reached 1800 my weight went to around 80 pounds where it has stayed for the past two weeks. I am now eating 2300 calories a day. How much of this is real, and when will I know if I am gaining? Also should I go to 3000 calories a day or 2500? 

Thanks! 

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