Hi, my crazy two year old son has decided to stop drinking unless it is his formula (he is on toddler soy formula due to allergies).  Prior to this he would drink water, juice, and flavored water.  All of a sudden, for the past three days he will take a sip of whatever i hand him and throw it and not even entertain it again.  I have tried every cup in the house and even bought new cups and nothing. He drinks an 8oz cup of formula in the morning and night and sometimes in the afternoon.  Anyone else experience this lil bugger routine or have any advice.  I'm getting nervous.... Thank you!