The Paterson tank will come complete with column, reels, lid, etc.
If the instructions do not specify the quantities, it is very easy to work them out.
Slide one reel right down the column. Pour in water until the reel is just covered.. Measure the water you have poured in.
Repeat for two reels and for three reels..
The volumes you get will be very slightly more than you need as you have measured them without films being in the spirals - but the quantities are insignificant.