I see some people (cough cough Aggie cough cough) struggling, so I wanted to recommend a few things:
A big cup! A 10 oz cup is too small. Its kind of like how taking smaller bites makes you feel like you ate more, you know? So you feel full from those little cups. Plus the memory part, having to refill up more prolongs the responsibility. If you use a bigger cup you won't have to refill as often, and you can say in your head "just finish three of these and I'm done" as motivation. You'll be way more likely to finish, trust me.
I also recommend a pitcher (or a bottle large enough to contain all of your water for the day). Using a pitcher and just filling it up with how much you want to finish by the end of the day is an easy way to make sure you get it all down. So you'll just know that that pitcher should be empty by the time you go to sleep (or a few hours before then for my ladies who pee a lot, me included
) without having to count cups and everything. Counting cups is the fastest way to not make it... that's math and misery
If you can't keep a pitcher at work, I recommend getting serious about a 64 oz water bottle. I also like this since my pitcher is only ever halfway full, which makes me feel like its not a lot. Its abot 3.5 cups for me. I finish by like 2:00.
Drink a large cup with each meal. Don't stop till its gone. Another thing that makes it hard is feeling like you're just randomly dropping life and drinking water. You can't keep that up. That will put you in "temporary habit" mode. This isn't just for the challenge, you should think of it as for ever. If you don't find a way to make it fit your life, it won't ever become a permanent habit. So drink with meals.
Lastly, large gulps. Don't think while you drink, and open your throat as big as you can! You'll get used to it. It will become automatic. If you actually taste the water you're not going to able to finish. Because water is naaaaasty when you're not thirsty.
Hope this helps somebody. God bless