The first couple of days without food will be horrible and you won't be able to think about anything other than food. After that period is over, your body will know it won't be getting food and the hunger will stop, instead your body will make you feel much more thirsty.
I haven't tried dehydration yet, but depending on the person you will get bad headaches, your tongue and throat will hurt and you'll get dizzy/faint.
It all depends on your self control and determination to ctb with this method! It takes a long time to die this way, it's not instantaneous like other methods, hence why some that responded in this thread are telling you to try something else.
I hope you succeed and won't be in too much discomfort with this method! <3