I need help finding better ways to help our daughter remember she is supposed to ask for things, not just yell out the word for the item she wants. I think she is picking this up at school and it's driving us crazy. She will say "Milk!" "Water!" "Tissue!" instead of saying, "Could I have some milk/water/a tissue."

Help. Other than repeating back to her "May I have some milk, please?" or ignoring her when she yells out just words, what can we do to get her to start asking nicely for things again?