For long storage , I like 3 buckets. Top bucket has a big block of ice (blocks outlast cubes about 4 to 1) with a lot of 1/4 inch holes in it. The next bucket has the eels in it with seaweed. This bucket also has lots of holes in the bottom. The bottom bucket has no holes. The idea is for the ice in the top bucket to keep everything cool and to drip water on the eels in the middle bucket to keep them moist. The bottom bucket just catches all the slime and melting water so it doesn't run all over the car carpet!

You need to empty the bottom bucket every now and then so the water doesn't get high enough to get into the middle bucket with the eels and drown them. Don't worry about feeding them. If you keep ice in the top bucket , the eels will last many days.
Some people don't use a top bucket for ice. They put the eels and the cubes in one bucket. That works fine too but if you want to use block ice which lasts a lot longer , use the third top bucket.
Now that the question is answered , I would say that Don at Weekapaug Bait and Tackle ( which is ground zero for the tourney) knows we are coming and is not likely to run out of eels.