What should I do?

For macbooks, any water will go on the other side of the motherboard, the side you can’t see unless you take the board out the machine. If you ever split water on a macbook and it stops working its normally considered water damage and needs to see a tech. There are many locations out there that repair motherboards. If you can remove then ship it you’re looking at $100 to $500. There are some shops posting repairs on eBay for under $300 where you can send your board in to repair then they bill you after with whatever price is posted on the listing. Just make sure you read the reviews before choosing to send your board away. Some will do an exchange where they give you couple dollars off another board when you send them your damage board.