What Causes Vomiting In A Toddler?

my 2 yr old 8month toddler has thrown up 3 times since this morning. The vomit looks like cottage cheese texture. What can it be and what can I give her. I m afraid to feed her soup because she might just vomit it right out. Can I give her tea? I just gave her 4oz of juice and 5oz of water mixed together because she doesnt like to drink water alone. Please Help!