Watercolor with some white gouache.
I like using the M. Graham brand of gouache. You can mix white with your watercolor paint and it will take on the consistency of gouache. (It will also lighten the paint color) If I remember right, the M. Graham brand uses honey for the binder in their line of gouache
I use a different brand of watercolor-I think Winsor & Newton. Those would be wonderful names for two cats, wouldn't they?