This is the same as in https://github.com/googlemaps/js-samples/tree/gh-pages/styledmaps/wizard but can parse state from url.
Clean start: http://fdim.github.io/google-maps-styler-ui
No labels for water: http://fdim.github.io/google-maps-styler-ui/?[%20{%20%22featureType%22:%20%22water%22,%20%22elementType%22:%20%22labels%22,%20%22stylers%22:%20[%20{%20%22visibility%22:%20%22off%22%20}%20]%20}%20]