Myfitnesspal.com is fantastic for tracking everything including water. I also have a giant water bottle that I fill every morning and drink from thru the day. Rather than tracking small cups of water all day, just buy a $5 giant reusable cup that you drink from. Some have measuring units on them too. At end of day you will know exactly how much you drank, and the next day your start over again.
anon-e4ddf5ec-924e-4a7d-b587-080cb3939591@cf8ee123-c709-465c-86c9-ce2303edb481.anon and Tinkntx like this comment.