So I read its anywhere from .9 - 1.3 - 2.0... What is the deal with the grist to water ratio? What works best? What is the best ratio?
Between 1 and 1.5 quarts per pound og grain, there are brewing apps that can calculate the strike and sparge water for you, just plug in your recipe.
Also depends on your system.
Depends on your system. Typically, people pick a number between 1 and 2 qt/lb, and just stick with it. There is some theoretical difference in fermentability, but it's slight.
"Be excellent to each other." -Benjamin Franklin
I do 1.5 qts./ lbs , work well for my set up (round 10 gal MLT) easier to stir in. Some times go to 1.75 qts if I'm lazy that day. Cheers