How to use leftover bath-water to water your yard? Discharge hose?

I'd like to star using my bath-water to water my yard. I don't want to install a greywater system. I just want to get a pump of some sort which will pump the water through a regular garden hose which I can stick out the window weave through the front door to water the yard. I'm thinking maybe a discharge pump like those used to empty a spa or pool would work, but I need something that can attach to a garden hose, since a short discharge hose just wont do it. Any suggestions on what to buy?