Most generally, preparing about a week's supply of food is a wise choice. Special care for leafy greens - After greens have been rinsed, it's a very good idea to use a salad spinner or towel to dry off any moisture. Even though many iguanas get a good supply of water from the food they eat, dry leafy greens last longer when stored as dry as possible. It's recommended that you store the leafy greens seperate from the other foods. Placing greens in a plastic bag and removing as much air and moisture as possible is a very good practice in keeping them fresh for as long as possible.
Many people also store the leafy greens, wrapped in a paper towel, in a plastic bag.
The paper towel will absorb the moisture, keeping the greens fresh. Storing food - Whether the food provided is prepared daily or weekly, proper storage of the food will ensure that the iguana is getting fresh, quality food at all times. It's important to note that fresh food is good food, and when in doubt, do not feed any food that may have started to spoil. Plastic bags are recommended so that the air can be squeezed out, keeping them fresh. Generally, the food will remain fresh in the refrigerator for about a week.