Hang your wrinkled shirts from a towel rack or door hook while you shower. The steam from the shower's hot water will smooth virtually all creasing.
Toss your shirts in a dryer with a damp towel for 10 minutes. The towel's humidity and the heat from the dryer provide the same effect as the shower treatment.
Fill a plastic spray bottle with a teaspoon of fabric softener and a cup of warm water. Mist your entire shirt with the solution and hang it up for 10 to 15 minutes. Once dry, your shirt will smell fresh and be wrinkle-free.
Mist the shirt with plain water and dry with a hair dryer if you do not have access to fabric softener, a shower or a full-size dryer. For best results, perform this step while the shirt is hanging.