Combine flour, baking soda, and salt. Set aside. In bowl, mash together the butter, vanilla, sugar, and brown sugar until smooth and fluffy. Add egg. Gradually add the flour mixture and milk until just blended. Stir in chocolate chips, adding 1 teaspoon of water if necessary to help mix. Grease 2 cookie sheets. Using your hands, place four big balls of dough on each sheet, spacing them evenly. Moisten your hands and press each piece of dough to flatten it out. Bake for 12 minutes.