iOS: Water can help curb your appetite and is vital for your health, so you want to make sure you get enough. Waterlogged is an iPhone app that can help you track your intake with minimal effort and analyse past data for an accurate look at your water consumption.
Tracking is really easy because you just have to enter glasses and water bottles once. Every time you drink a (partial) glass or bottle of water you can just choose it from a list (completely with photos, if you add them) and it will be added to your tally. Waterlogged will also let you set reminders so you don't go too long without something to drink (though bear in mind that the oft-quoted eight glasses a day figure is largely a myth).
Waterlogged is a free app, but in-app purchases ($2.49 per year or $3.99 forever) buy you no ads, unlimited reminders, and detailed tracking drinking graphs.
Waterlogged [iTunes App Store]