How old are you? What do you think your percentage of body fat is? Natural?
I think you can probably do something that is more productive than just jumping to a water fast.
Without knowing the answers above I can make an educated guess that you have about 60 pounds to lose, and you are around 30-35% bodyfat - but I am basing those numbers off estimates if the general, natural population. However, if you are natural, it is relatively unlikely this guess is too far off.
Given this, I would highly recommend you get a meal tracking app and start weighing, measuring and logging everything that you eat. Everyone always wants to start with details, but getting an idea of precisely what is going on right now will give everyone an easier we at if suggesting lasting changes. Logging is usually a real eye opening experience for most of us anyway - we are all pretty dishonest with ourselves when it comes to this stuff.
General advice, if you have a job that isn't highly active, you probably burn about 2,800 calories per day. Most people will say to drop a small amount - 300-500 calories per day and increase exercise by that same amount. This will lead to 1-2 pounds of fat loss per week. If course, these guidelines often make people think they should lose 2 pounds a week and they aren't weighing and logging and then they have a cheat and all these inaccuracies lead to a real loss of 0.5 pounds or less per week and they wonder why they stall.
With over 50 pounds to lose, I think something a little more aggressive could be in order - say, dropping 750-1000 calories per day and keep the exercise moderate - try getting an extra 300-500 calories/day worth of exercise.
Keep protein high, for you around 225 is good to start but as you get leaner, 200 grams will be fine.