How much should this cost?

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We have an outside toilet with no sink, which we don't use because I don't want the kids washing their hands in the kitchen sink.

Does anyone have experience/knowledge of how much it ought to cost to put in a sink? I'm presuming the water supply and drainage would somehow link to the supply already in place for the toilet.

If there is space for a sink it will be easy to put in a sink with cold water but unless you have an electricity supply or hot water supply nearby, it is likely to be quite a lot of work to get hot water there.

Not sure - but have you considered a hand sanitizer in there?

Oh and if your grey (sinks and gutters) and black (toilet waste) are seperate then the waste might be tricky to add. They are combined where I live so it would be an issue but are totally separate in some areas.