Here is what we used:
1 block of dry ice
1 5 gallon bucket with lid
20 feet of clear tubing cut in 7 ft lengths
My husband drilled 3 holes in the lid to match the size of the tubing and cut the tubing for me :) Then we pulled the tubing through and added funnels at the end. We filled the bucket 1/4 full of water and added the dry ice. Place the lid on the bucket but do not snap it down. We then placed the funnels in the bubble solution and we got bubbles!
When the dry ice was almost done we filled the bucket up 1/2 way and poured our bubble solution in the bucket and watched it bubble :)
I LOVE being a homeschooler!!!