So, I'm doing my first auto grow as well with 1 GG#4, and I started out by splitting 2 liters between 5 plants in 5 gallon pots. I think it works out to be like just over a tenth of a gallon or .12. However, I watered all around her rather than away from her, and with that much soil surrounding such a little girl it seemed to work out pretty well. I kind of made a circular pattern expanding outward so as not to drown her, and it was like every 2-3 days at first. Whenever the soil surrounding her was looking pretty dry. I was told these autos are pretty sensitive compared to fems or photos so even tho you have to exercise some caution, I would say just resort to your Greenthumb instinct a little and you'll do great!😉 I'm no expert either so hope this helps. It worked out for my GG#4 girl. Good luck, and happy growing!☺️✌️