Sometimes, things just work together, ya know?
If you ever find yourself studying the ocean's movement, and if during that study you are instructed to build a model ocean but can't find any sand, it may all work out anyhow, if you happen to live on a golf course and have one to three children who do not mind being sneaky little thieves on occasion.
That is how we managed our project...bunker sand snatched from the 15th hole:
(we really only borrowed it)