Hello Alex. Some people would say that you have to make it fresh for each time you drink it.

I have only done 2 master cleanses, but I made a days worth the night before. I only made 6 glasses worth for each day. I use a 1.89 litre jug and put 48 ozs. of water in it ( 6 glasses X 8 ozs. each ) I would then add 6 ozs. ( this equals 12 tbs. ) of fresh squeezed lemon juice and 3 ozs ( this equals 6 tbs. ) of maple syrup, note that this is half of the syrup called for. Lastly, I added 1 heaping tsp. of cayenne pepper which is double what the recipe calls for.
This is all I drank each day.

If you have time to make it fresh each time you drink it, you may want to do that, but I didn't really notice any difference by making a days worth.

Congratulations on starting this, you won't regret it. This is really mind over matter.

Take care and good luck.
Ed