There are several ways to do short fasts. A 2-3 day fast is one way. To test it out you might want to do a EOD fast (every other day), that way you eat one day and Water Fast the next.
One thing to be aware of...while fasting your body is releasing lots of toxins so you have up and down days. Never break a fast on a down day, recognize it as a detox day and if when you feel better you want to break the fast, then that's the time. Water Fasting will force you to detox more rapidly than a juice or master cleanse so if I would recommend juice fasting or master cleansing before a water fast. To save on money you could always do 5 days of juice fasting and then 3 days of Water Fasting or something like that.
There are several other more experienced fasters here that will hopefully be able to help you out more. Good luck!