Support the plant above some water containing vessel, e.g. on two small 1x2 inch boards above a kitchen pot or sink. Place the wick into the water. Capillary movement of water into the pot will take place as the soil medium dries. A capillary mat is a self-watering mat made of thick felt, one portion of which is laid in the bottom of a sink, the other on a drainage board adjacent to the sink. Plants are placed atop that part of the mat on the drainage board and the sink is filled with water.
Capillary mats work best for plants in plastic pots with many holes.
Clay pots should not be used with the capillary mat as the pots will themselves absorb the moisture, transferring little to the soil medium. The wick method may be a better choice for these. After watering the plant, construct a tent over it using a dry-cleaning bag or similar clean, clear plastic material. Provide ample air space. Move the plant to a more cool location.