I am sorry but I do not agree with your thought of not hospitalizing your friend. In my opinion, he/she requires hospitalization and treated accordingly.
needs effective intravenous antibiotics usually, to get cured. This cannot happen on OPD basis. Your friend has also vomited 15 times which is a grave sign.
Please go ahead with admitting her/him. Continue to give paracetamol
to control the fever.
I wish your friend quick recovery.