Where can I find Acid preserves in Oberarth?

Acid preserves can also be found in these cities:

Altdorf Baar Buchrain Buochs Cham Ebikon Einsiedeln Emmen Goldau Horw Ibach SZ Ingenbohl Kriens Küssnacht Lucerne Richterswil Rotkreuz ZG Stans Steinhausen Unterägeri Urswil Wädenswil Zug

You can also find this in Oberarth:

Fish Sticks Roll Cheesecake Help Sunflower Seed Bread Power Bar Salads Iced Tea Coffee Infant Food Dips And Sauces