You are giggling at my city thing. I live in a tiny mountain town outside of Asheville so when we need supplies we have to drive in. It is funny to me too after living so many years in Manhattan and now calling Asheville the big city.If the “city” has a pool store, then swing by the pool store and get some bags (or a pail) of cal hypo. By this time of the year they’ll probably be running “end of season” sales. The big box hardware stores (HD, Lowe’s, Ace, etc) will carry pool chemicals too.