My aunt is a big fan of Prima Taste Meal Kits. She lives overseas and stocks up on this when she's in Singapore. It's pretty goof proof, I've tried a few packets myself. Mostly, I like the Mee Siam, fried dry without the soup part. If you want more oomph in your food then just use 2 packs instead of 1.
Meal Kits cost $6, Sauce Packets cost $2, Gift Packs (pic below) $16 to $19. Most people think its a tourist thing and it makes a great gift for out-of-towners.