For those cooks out there that don't have 'fancy' equipment (i.e. a food processor or means of grating ginger), I present these solutions!
I kneaded the dough by hand and I found that if the dough was too dry and crumbly, wetting my hands while kneading added the perfect amount of water. In all I suppose I added 3 teaspoons of water. I also added a bit more ginger juice since I like a very gingery cookie.
A note on the ginger juice: I saw someone wondering how they could extract juice if they didn’t have a grater and I came up with a solution. Finely mince a piece of ginger the size of your palm and place in a 1/3 cup size measuring cup with two pinches of salt. Place a 1/4 cup size measuring cup inside of the 1/3 cup size and balance something heavy on top, like a big book or a small saucepan filled with water. Let it sit for 10 minutes or so, then squeeze the ginger until no more juice runs out. It should give you a tablespoon or so of liquid.
I also made the liquid with corn syrup and honey in addition to the simple syrup because I didn’t want the sugar to burn (I am notorious for that).