Go to town, about a 3 hour trip from were you say you are and buy your self a pitcher type water filter and use that just for your shaving cream. If you purshase enough filters you should be good through the rest of the winter.
bottled water is heavey and expensive, so I would not reccomend it.

Hope that gives you a glimer of hope for your problem.

Most Sincerely, tinkersd of SRP!