The Messenger of Allah (peace be upon him) said, “Whoever feeds a fasting person will have a reward like that of the fasting person, without any reduction in his reward.” (Al-Tirmidhi, authenticated by Al-Albani)
Buy a box of dates and give it to the masjid, for the sake of Allah alone. The fasting people will break their fast with your dates and you will In Sha Allah get the reward of their fasting.
The Prophet (peace be upon him) once visited Sa’d Bin Ubadah who presented bread and olive oil to him. The Prophet (peace be upon him) ate it and said, “The observers of fast have broken their fast with you (this is the literal translation, but the meaning is: ‘May Allah reward you for providing a fasting people with food to break their fast.’); the pious people have eaten your food and the angels invoked blessings on you.” (Abu Dawood)
Sheikh Muhammad Bin Saleh Al-Uthaymeen said, “Those who have the ability should strive to feed those who are fasting (when it’s time to break the fast) either in the mosques or at other places. This is since whoever feeds a fasting person, will receive the same reward as the one who is fasting. So if a person feeds his brothers who are fasting, he will receive the same reward as them. Therefore, those whom Allah has granted wealth should take advantage of this opportunity to obtain a great reward.” (Su’alan Fis-Siyaam)