The water module is only available for a range of crops in the tool:

Alfalfa, Barley, Coffee, Cotton, Dry Bean, Maize, Millet, Oats, Other grain, Other legume, Other N-fixing forage, Other Non-N-fixing forage, Peanut, Perennial grass, Potato, Rice, Rye, Sorghum, Soyabean, Spring wheat, Tomato, Vegetable, Winter wheat

It is not available for the following:

Apple, Canola, Clover, Grass-clover mix, Hops, Rapeseed, Tea, Tree Crop, Blueberry, Raspberry, Strawberry, Other, Other root crops, Other tuber crop

Therefore you can only make a combined GHG & Water as