The soup may have caused a short circuit and fried your laptop. If the laptop does not turn on when plugged into the AC outlet then a new battery will not solve the problem.
A fired motherboard is most likely the issue. A new motherboard could be rather expensive. For example, checking around for a new replacement motherboard for my Lenovo IdeaPad Y470 shows that the only place to buy one is on ebay sold by a distributor from China at a cost of $180 including free international shipping.
My Nexus 7 (2012) tablet recently got fried as a result of around a teaspoon of water. It was in a bag by itself. Apparently, a little bit of water spilled into the bag from a bottle that was not tightly closed.
Not realizing a little bit of water spilled onto it because the surface was dry, I turned on the Nexus 7. The screen displayed distorted graphics for about 1 second and shut down. After that I looked in the bag and notice a bit of water, turned it upside down and I would say about a teaspoon of water spilled out.
After 7 days of letting it dry the Nexus 7 does not turn on even when plugged into the AC outlet.