Last week I helped a friend move his boat up the IntraCoastal Waterway (ICW) and my MacBook Pro got splashed with salt water. It was in "standby" so partly powered up, and a look at the USB ports showed some electrolysis took place. Once in a dry place I opened it to see that part of the motherboard looked like a scene in Sim City after Godzilla flamed it. Other corrosion indicated that it's time for a new MacBook.
I ordered the Universal Drive Adapter on Thursday and when I got home on Monday it was there waiting for me. Although I had a pretty recent backup, the great news is that the SATA drive is fine and I retrieved trip photos and files via the UDA's USB interface.
I already had the #00 Philips screwdriver required to remove the bottom cover, and as suggested, I used a 1.5mm flathead screwdriver to remove the battery. I don't expect to reuse the disk drive soon but the UDA from iFixit retrieved my data.