I assumed Ihraam from the Meeqaat. Later, my friend spilled juice on my Ihraam clothes. Does this invalidate my Ihraam? Am I required to expiate for this?

All perfect praise be to Allaah, The Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.

There is no expiation due on you for what you have mentioned in the question. Moreover, this does not invalidate your Ihraam. What you have mentioned has absolutely no effect on your Ihraam. The scholars unanimously agree that it neither invalidates Ihraam nor requires expiation.