Q. I just moved into a new apartment, and I did not get a chance to kasher the kitchen yet. Am I allowed to use the kitchen for cold? what about the water from the sink? I remember hearing once, that one can only use a non-kosher kitchen for a short term use? is that true?
A. As long as you don't use anything heated (over 45°C) including the water in the sink, and the counters and other surfaces are clean of any food or grease remains, you can use temporarily the kitchen.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit"a