device not charging after coffee spill, liquid went only into port

Hi, so I accidentally spilled some coffee in my backpack (coffee top wasn't screwed on right), which dribbled down then got into the USB/charge port of my 2015 MacBook.

I tried, in a panic and idiotically, to charge immediately after, without drying out the port completely (but will I really know if it's dry?), and of course it won't charge.

Have I done lasting damage? Or can I try the rice-in-the-bag trick later and cross my fingers? Is there something else I should do? MacBook is working fine, but I am worried that I won't be able to charge it again, ever!