I like knowing what's in DD's food too. The carton coconut milk would work, but it has lots of added ingredients I'd prefer to leave out. Here's the link to the recipe - I can't take credit for it! http://www.thenourishinggourmet.com/2008/05/coconut-milk-tonic.html
I've bought canned coconut milk in bulk on amazon, as well as the dolomite powder. The canned milk was cheaper to buy in bulk (plus it's organic!) than buying it locally.