Why would you be chayav to have either two sinks or a kasherable single sink? The laws of kashering are such that having one sink that you thought you would be kashering between meat and milk would make use of that sink almost impossible, as there has to be 24 hours from the time anything hot (certain temperature) was poured into the sink (the hot water from the spout included), so you would not be able to use anything hot in the sink for that period of time, then you could kasher the sink, which would make it parve,and then the same thing goes the other way. People I know who have had only one sink have washed their dishes in plastic bowls that they place in the sink and probably do not use water that is soooo hot and do not pour anything that is either meat or milk that is hot at the temperature that is problematic into the sink. It may be a little tricky, but requiring somebody to put in plumbing that would enable 2 sinks is not practical. The people who first lived in houses that had running water and subsequently had enough money to renovate their kitchens did not necessarily add a second sink as there may not have been enough place in the kitchen to accommodate one.
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