Keep them Cool and Wet...
Store your lobsters in your fridge at 36-40 degrees F
Place them in an open container (like a pan or bowl) and cover them with dampened newspaper or paper bags, a damp kitchen towel, or seaweed.
DO NOT SUBMERGE THEM IN FRESH WATER OR SEAL THEM IN A PLASTIC BAG - THEY WILL SUFFOCATE
Treat them right, they’ve had a rough week.