Our cabbage from this past spring was my first attempt. It was so dry and hot I ignored the cabbage expecting it to give up, but still got a few heads. I cut a dishpan full and weighted it in grams and then multiplied by .02 and added that much sea salt. I squeezed the cabbage and salt together and kneaded it until I had a lot of juice, probably about 10 mins total.
I packed cabbage in 1/2 gallon jars using flat end of a wooden rolling pin and poured in juice from the dishpan. I did not have to add any liquid other than what came out of the cabbage. It sat about 2 weeks and then I moved it to a fridge. I just finished some off last week and it still had that fresh squeakiness to it.
It turned out so good it inspired me to do a few more jars of pickles and other vegetables. I used sea salt and boiled tap water that had cooled, so pretty cheap to do. I've got some water boiled and cooling today and will try a version of kimchi using swiss chard and few radishes tomorrow.