Most of the Malaysian/Singaporean restaurants here in the Bay Area are not quite authentic because their chefs use local ingredients and adjust their recipes to suit local tastes. Here in San Jose, we're lucky to have a branch of the Singapore-based restaurant chain Prima Taste. Prima Taste ships all their sauces pre-made from Singapore, and so preserve the flavors.
We're also lucky that an Asian grocery near our place carries the Prima Taste brand of sauce and seasoning packets, for a pretty good price. This is their Singapore Curry Laksa.
You have to buy all the fresh ingredients - the noodles, bean sprouts, fish cake, shrimp, and egg. But to make the soup you just add the contents of the spice packet to water and bring to a boil, then assemble all the ingredients. In no time, you'll have a delicious bowl of fragrant laksa.