Check out the Spyderco line of hones. They are meant to be used dry and they work just fine. I only have the UF but I have heard from others who have the lower grit Spydercos and are perfectly happy with using them dry.

If you want to go dry all the way, you could get the 3 stone set of medium, fine, and ultrafine. The UF might be sufficient for touch ups but you would need the others for anything more than that.

Keep in mind though that wet honing isn't really all that messy. A towel on a table or across your lap will catch water coming off the hone. A lot of honing videos show people pouring water onto the hone but you really don't need that much water. Most of what is poured onto the hone immediately runs off. You can use a spray bottle to drastically reduce the amount of water coming off the hone. Also, you can have the hone in a kitchen pan to catch the water. My point is that you have options. You CAN do it dry but you don't necessarily have to rule out wet honing just because of a small bathroom.