Um. well technically skin food is a mix of glyscerin and rose water. Rose water is not water that has roses soaking in it. It is a distalation of the rose essence that includes the esential oils and juices. This can be done with other things like herbs and limes and so on as well. The thing is though that the stuff does need refrigeration or preservatives to last more than a few short weeks. Here is the primer on making rose water again. I do this regularly when I piss off the girlfriend.
http://www.care2.com/greenliving/ros...-your-own.html