"in the cup/ A spider steep'd"

We had two pint jugs of chocolate milk in the fridge, one with an expiration date of 11 May and the other with 15 May. Faith asked for some chocolate milk and got out the 15 May one. I looked at it and told her to get out the other one because "it expires sooner." She switched out the jugs, looked up at me a little uncertainly, and asked, "So... the other one has spiders in it?"