When your daughter wants a drink or when your wife gives her a drink she will use the
symbol to show your daughter what that
symbol represents. When your wife thinks she has made the connection between the symbol and what it means she can then give the symbol to your daughter and when she wants to request a drink she will put the symbol in your daughters hand and move her hand to put the symbol into your wives hand. At the same time saying your daughters name XXX "wants a drink".