I've been doing the MC for close to 6 years now and have been around this forum for that long and I've never heard of any "different version" that calls for 10 oz of water. Now there is the very common mistake that I myself made at the begining where it calls to make it all in a 10 oz cup. The TOTAL of the ingredients add to to 10 oz but for some reason I thought it was the water and I too made my first MC with 10 OZ of water till someone else pointed out my mistake.
Do a search on the internet for "master cleanse PDF" and find an version by Stanley Burroughs that sez use 10 oz of water.
What version do you have and who is it written by?