It's one of those must - haves when traveling — I washed mine in my Toronto hotel sink (read about that broom closet room here) and wore it twice. (notdeadyetstyle.com)
Other than that, hotel sinks can be used for more than just washing bottles or your hands, you can bathe your baby in it too! (havebabywilltravel.com)
I would start with something very versatile, such as the One Size Diaper Cover from Tiny Tush and some prefolds.The diaper cover can be used many times as long as it doesn't get soiled and would be extremely easy to wash out, even in a hotel sink and hang to quickly dry. (tinytush.com)