We do not give a poor person who is traveling from place to place less than a loaf which costs a pundion when four seahs cost a sela. [If] he stays overnight, we give him provision for night-lodging. [If] he stays over Shabbos, we give him food for three meals.  Whoever has [enough] food for two meals may not take from the [charity] plate. [If he has enough] food for fourteen meals, he may not take from the [charity] fund. The [charity] fund is collected by two and distributed by three.

This measure is said with respect to Kohanim, Leviim, and Yisraelim.  If he was saving, he can take half and give half. If he had a small amount, he puts it before them and they divide among themselves.