Okay, I just love other bloggers!  Child Central Station mentioned she had her own version of moon sand using baby oil (instead of water)!  I knew I had to give it a try with the Ocean unit the kindergartens at my school do at this time.   It is wonderful!  It definitely holds its shape very well.

several boxes of cornstarch (gives the sand its holding power)
large bottle of baby oil

I do not ever measure when making moon sand – I try to have a good ratio of cornstarch in the sand.  I purchased a large bottle of baby oil and added it till the sand had good holding power.  Then I add seashells and other “beachy” items.   I found a great little tube of sea creatures at Target for under $4.