It will evaporate slowly, keeping the immediate area more humid for a week or two. Be careful not to have it so wet that water accumulates at the bottom. Plug a small room humidifier into a timer that can be programmed to switch off and on for an hour or two several times a week. Fertilizer First of all, understand that it is nearly impossible for a plant to starve to death in a matter of weeks. Avoid feeding the plant for several weeks before you are planning to be away.
Fertilizer encourages new growth and then the plants water needs are greater.
When you return, go back to your normal schedule of fertilizing. Water soluble fertilizers such as Bachman's Excel Gro are easy for both you and your plants to use. If it will only be a short time, simply water and move the plant to a shadier area. Plastic pots dry out less quickly than clay containers. If the plant is small enough, you can place it in a large, clear plastic bag for a few days to help maintain water and humidity.