How much water should my little girl be drinking

Wow ok, my doctor said I need to drink 10-13 glasses of water a day since I'm pregnant. So I wanted to look up how much Jannel should be drinking. According to a google search she needs to drink 1.3L a day which = about 5 cups. I'm not sure how much she drinks now though. Yesterday she had quite a bit more than normal and her bladder couldn't seem to hold it. She had several accidents while we were over at her uncles house. I'm wondering if drinking more water should be something that she just needs to work on. Today I wasn't going to give her so much, it's just that she's always hungry and we don't have that much food. I know that sounds horrible but what am I suppose to do. If she finishes her bottle of water then I try and find her something even if it's just a piece of bread. However she has been asking for water all day today and I'm not going to deny her it just because. The only thing that worries me is that we're at her uncles house again today and I don't have a single change of clothes for her. I'm not sure how much water her water battle contains but I think it's about one cup. In which case 5 cups is no problem at all. She enjoys drinking water I think because she likes to play with her water bottle. We've been working really hard at making her keep it at the table and she's done well. She's not the one who has the problem spilling it but other ppl don't see it sitting on the floor and knock it over. At least it's just water, right.