white vinegar; white distilled vinegar
White distilled vinegar is made from a grain-alcohol mixture. Most often used in pickling, its harsh flavor makes it more often used used in American kitchens as a cleaning agent rather than an ingredient. However, it is used often in Thai and Vietnamese cooking, both to pickle vegetables and in marinades and sauces.
You can use white wine, rice, or apple cider vinegar instead.
White distilled vinegar is available at every supermarket and is quite cheap. You may, however, want to seek out Thai brands.
Kept sealed and dry it will last for a long time.