Homemade Mortar

You'll need...

•    pvc pipe (wide enough for a bottle to fit inside)
•    pvc cap
•    two bottles 
•    dry ice 
•    water
•    cement glue

Glue the cap to the pvc pipe with cement glue. Wait for it to dry.Put dry ice in bottle and water. (but only put water if you want it to explode faster!!!). Then put the bottle in the pvc pipe and on top of that put the other bottle. If you want the other bottle to explode too put only dry ice on that one so there'll be a delayed reaction and both won't explode at the same time.