Is it permissible to dispose of vomited food in the toilet if it is difficult to leave the house and there is a fear of the sink becoming blocked?

There is no objection to a person vomiting in the toilet, which is "a place of impurity," because vomit is repulsive and impure. What is forbidden is dishonoring food that could be benefited from by placing it in impure places or garbage, because that is a form of ingratitude for blessings.