I live down under and use the metric system.  So seeing as there is not (as far as I can tell) a bulk guide for us I am posting mine.

I really hate to make up single glasses.  The cleanse calls for 6-12 glasses per day. I like to make up 2 days worth estimating 10 glasses (nice round figure) per day. Some days I drink more, others less.

I have played with the figures slightly to make it sooooo much easier to make. All details will be here so don't worry. This is going to be quite detailed so you can follow easily.

Original 1 glass recipe:
1 empty glass = 10oz  which is 295.735 milliliters or  for sanity's sake = 300ml glass.
Water = 8oz  which is 236.588 milliliters or.... 240ml
juice = 2tbs (US tablespoons are = to 14.786 milliliters or 15ml) so thats 30ml for 2 tbs
maple = 2tbs = 30ml

Therefore 1 glass is 240ml + 30ml + 30ml per glass = 300ml of total goodness to drink down. Don't forget the cayenne =)

*note: 300ml of drink in a 300ml glass is bad i really don't know how Mr Burroughs did it ;-/ It was very full. I rather use an 500ml glass... or as you will see a big 3lt container.

Anyway to the bulk recipe.   I like to use the 2lt empty coke bottles to make it easy for me. Easy to carry, store, fill, re-use.

My average of 10 drinks now works out to:
water: 2400ml
juice: 300ml
maple: 300ml
= 3lt

Super easy.  Get a big container and start measuring and pouring. I usually make up 6lt at a time and store them in the bottles. This way I have well over the possible 12 drinks I may need on a full-on day. I also then only need to spend every second day juicing.
I have had no problem with making up this much at anytime, however when I tried to push it and make 4 days worth by the time I got to them they were a bit 'wrong'. Still drinkable but I felt they lost the 'goodness' which is now quite obvious.... 4 days doh!

Well I hope this proves useful to some.

Good luck to you all and Happy and fruitful cleansing.