It is best not to let tap water or any other substances (and that includes sweat, make-up etc) get in contact with your eyes for up to 5 days post epiLASIK. This is because there may be germs which can cause you to get an infection.
After 1.5 weeks post-op, it is definitely OK to wash your face and hair with your eyes closed. This is because your surface epithelium cells would have healed and you may also resume light sports such as jogging and yoga 1.5 weeks after a surface-based epiLASIK procedure.
Dr. Tony Ho