i don't know if this has been covered, but this is what i have started doing.
when making the base and get to the add water part I DON'T..
i just put it in the plastic tubes and freeze it, that way i get 50 curry's into one draw in the freezer.
when i want to make a curry i take one tube out and de-frost it, add the water bring to the boil and make sure it's the right consistency.
my tubes are 1Lt and i get 5 curry's from one tube once diluted.