Break up one handful of peat moss into bowl for each lily bulb to be stored. For instance, if three of six bulbs are planted, store the three unplanted bulbs in three handfuls of peat.
Add about ¼ cup of water per handful of moss to the bowl. Gently work the peat so the moss is moist all the way through. The moss shouldn't drip or feel soggy.
Wrap each bulb in a light layer of peat moss. Gently squeeze the moss around the bulb so it stays put.
Place the bulbs, side by side, into a brown paper bag. Roll the bag shut and place it in the back or coolest part of a refrigerator.
Store the lilies in the refrigerator for up to three months this way. More water shouldn't be needed.