It is 30L of water per cylinder as per Manual....means Total of 60L ....Suzuki always mentioned capacities of CNG Cylinder in Lits of Water they can Hold......and it can hold aroud 10Kg of Gas at 200Bar...
as My Baleno has a Cylinder of 55Lit and it can hoold around 8.5Kg ofgas at 200Bar
all at about 20'c