I'm the same as you, if it weren't for the water reminders on my phone, I would have probably died by now. I just forget to drink because I don't feel thirsty.

A trick that helps me is to drink from a medium to large bottle, not a glass; it makes it easier to track how much you're drinking, because the number of times you refill the bottle is lower than it would be for a glass of water.

Also eat plenty of fruits and vegetables that contain lots of water, like cucumbers (these are like 90% water, and you can snack on them without thinking of calories), apples, and whatever you like. Adding plenty of these to your diet will ensure you at least get some water so you won't get super dehydrated even if your phone fails you. Also, soups are awesome, especially in the winter, and there are cold soups for summer (though I have never been a fan of these).