To add some realism and additional difficulty, my suggestion is to treat toilet water as being unsafe. To make it safe, water purification tablets would need to be used. Otherwise, if a player chose to drink toilet water that had not been purified, they would run the same risk as drinking melted snow that had not been boiled. It seems like this would involve a fairly simple change (changing toilet water from safe to unsafe) that might be well received by most players.
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