How can I fix an eye allergy without taking medications?

Washing and rinsing. If your reaction is due to cosmetics, washing off the offending agent right away can help. If it is due to airborne allergens coming in contact with the eye, flushing with water can help rinse things out. You can use cool compresses to settle the irritation and inflammation down.
Allergy. You may try cold compresses and avoiding the allergic trigger. Staying inside may help. Keep your air filters clean inside the home.
Couple of options. Allergy is treated in three general ways: avoidance , medications and allergy vaccines. Avoidance of known triggers is most imp. Use of otc tears or other cleansing eye drops can be helpful.