Condiments are often times the last thing someone thinks about while preparing their backpacking meals. Fortunatley, these things are packaged into single serving sizes and shelf stable. Here is a little guide that will share ideas on where to get those convenient little condiment packages (because sometimes it's not always obvious).
Butter and its imitators: fried chicken and fish shops, other fast food, continental breakfasts, diners.
Ketchup & mustard: Your favorite fast food place, grocery store delis.
Salsa/picante sauce: Fast food that offers burritos and convenience stores,
sometimes you can find 4-8 packs of tubs at grocery stores.
Ranch tubs: Fast food and Hidden Valley Dressing® in 4 packs at the grocery store.
Parmesan Cheese & Red Pepper Flakes: Costco and Sams Club food courts, any pizza joint.
Jam packets or tubs: Fast food, continental breakfasts at motels, diners.
Soy Sauce & sesame seeds: your favorite Chinese place or full service grocery store deli.
BBQ Sauce: fast food.
Salt and pepper packets: most places.
Mayonnaise and relish packets: Convenience stores that sell fried foods, deli's in grocery stores, truck stops, sandwich shops, or most places you would buy a hot-dog.
Marinara Sauce: Pizza Hut, Little Ceaser's, Sonic; most places that sell mozarella sticks or bread sticks.
Arby's® is great for Horsey sauce, their BBQ sauce, etc.
Many McDonalds® and KFC® have moist towelettes in packets.
There are also sites that have packets available for purchase: