You can use anything. As long as you have a larger container, and a smaller container to fit inside. I use 2 sized of my stainless bowls. Put some water in the bigger one....float the smaller bowl inside with something to weigh it down....but not too far down. After they're frozen....removed bowls....and you're left with a nice crystal ice bowl. (great to line your walkway with tealights inside.....PURDY !)
Wine holders.....get a bottle (same size as wine you'll server for dinner). Fill milk carton with water (greenery, cranberries or holly berries) Submerge the wine bottle in the milk carton (don't weigh it down with water...use rice or dried beans) When frozen....remove carton....fill bottle with slightly warm water to free it. Put in bowl and put your real bottle of wine in to keep cool. Again....PURDY !