In a blender add water, milk, salt, sugar, and eggs. Blend it up. Then add the flour, and melted butter. Blend for 1 minute.
Then place in the fridge in a tight container or leave it in your blender if you have a tight lid. And refrigerate for at least 2 hours or overnight.
In the morning scrape the sides and you are ready to go!
Pour 1/3 cup of the batter into a pan and make your crepes.