Yes, it would make loads of difference, I really struggle with water but for have been slowly increase and this week for the first time in my life I have managed 2l of water or more every day. You can see a difference in my tummy, so much so that my husband (who is a typical man and notices nothing) and my kids see a difference. Remember 1l of water weighs 2.2lb so if you're retaining then it will make a huge difference on your weight loss.
Also you need to be eating about an hour before and after, even something like a banana.