Yes, grass fed is necessary because of the omega 3 to 6 ratio. This is even more important if you are targeting autoimmune. And don’t sleep on the organs, I have found that those are important to immune-tangential things as well.
Another note: you don’t get dehydrated because of ketosis and glycolysis. You get dehydrated because you stop making insulin, insulin tells your body to hold on to water. The only other thing that does that is sodium. Not potassium, sodium. On this diet you are replacing insulin with sodium. Make sure to have very high fat and at least 5 grams of sodium chloride per day.