This is a great way to spend a lazy weekend afternoon with the kids! DIY Lava Lamps are so easy to make and you probably have all the materials you need on hand already.
In terms of the container you use, basically, anything transparent with a lid will work perfectly. We added glitter to ours to get a fun sparkling effect, and you could experiment with adding sequins or small beads.
Clear Water/Soda Bottles with Lids (make sure they’re cleaned before using)
Pour vegetable oil into the bottles until they’re about 3/4 of the way filled.