marriage - How can a man give a woman a gift without getting himself into a safek kiddushin?

According to jewish law a women is betrothed to a man when the man gives the woman a gift worth more than a prutah and recites the words "you are betrothed to me through this object".

How can a man give a gift to a woman that is not his relative without getting himself into a safek (doubtful) kiddushin (betrothal)?