Besides the fact that it also saves on all the water used to clean the glasses, both the paper and ink used to print the signs were probably created somewhere o

Besides the fact that it also saves on all the water used to clean the glasses, both the paper and ink used to print the signs were probably created somewhere other than California, meaning the printing of that piece of paper does not negatively impact the drought situation in CA in the slightest. Your comment is ignoring this and treating the usage of water anywhere in the world as if it's relevant to CA's drought situation.