Realistically how much weight can i lose in 5 days, any ideas PLEASE

this greatly depeneds on your diet and exercise... also your level of Testosterone!
But the highest amout of bodyfat and water you can lose in 5 days is 13-15 lbs.. without any drugs.. But the average person will not be able to do that because this requires about 6-8 hours of hardcore cardio.

You could prob loose 2 or 3 lbs. With a healthy diet. If you dont it the unhealthy way with starvation and lots of exercise maybe 7-10 lbs. But you'll ruin your metabalism and as soon as you start eating normally you'll gain the weight back and then some because your metabalism will be ruined.

are you talking about the master cleanse known as the lemonade fast? If so the average lose 1-2 lbs a day. Read more below.