Combine the ingredients all at once in a blender or with a handmixer. If you mix by hand, begin by combining the eggs, water, salt, and milk. Add the in the flour little-by-little until completely combined. Strain through a fine sieve to remove any clumps.
Heat a crepe (or wide) pan on medium to medium-high (depending on whether your stove tends to get too hot). Grease with a dot of butter or neutral oil. Add a ladle full (or about as much, carefully by hand) to the pan and rotate the pan in a circle with your wrist until there is a very thin layer of batter.
The batter will set and create small bubbles once it is ready to flip. Give it a good toss in the air or carefully flip with a rubber spatula and your hand.
Once set on both sides, remove the crepe to a plate and repeat until the batter is finished.