Put an ice bucket (in which you have previously poured salt) in front of a fan. Point the fans so that they blow on the ice. Alternatively, use one or more bottles and fill them almost completely with water (70%) and coarse salt (10%). Leave 20% space for the ice to expand. Freeze them, then put them in a large container (to collect the drops that form from condensation). Place a fan in their direction. As the salty ice from the bottles melts, the icy steam from the ice will join the air, the surrounding air will cool and the fans will blow it towards you.
The salt brings the freezing point of the water to a lower temperature, allowing you to get colder ice.
You can reuse the salt water from bottles by freezing it several times.