Whisk water, milk, eggs, vegetable oil, and salt together in a bowl. Slowly whisk flour into wet ingredients until incorporated. Let batter rest for 1 hour; stir again.
Heat a lightly oiled griddle over medium-high heat.
Drop batter by large spoonfuls onto the preheated griddle and cook until bubbles form and edges are dry, 2 to 4 minutes. Flip and cook until browned on the other side, 2 to 4 more minutes. Repeat with remaining batter.