What is the best allergy medication for itchy watery eyes, sneezing, and stuffy nose during day?

non sedating antihi: Any non sedating antihistamines like claritin, allegra, zyrtec or xyzal (levocetirizine) with or without over the counter allergy eye drops.

OTC meds: There are a number of good otc allergy relief medication with a very long duration and low cost. There are generic versions of claritan and zyrtec, for example. Often, the oral medication will cover all symptoms. If the eyes are a problem, zaditor (ketotifen) / alaway is the best otc allergy drop, and is much better than "get the red out drops". Artificial tears can offers some relief, especially chilled.

OTC or Rx?: Over the counter oral antihistamines (claritin, zyrtec, allegra) or antihistamine eyedrops are good options. Prescription nasal antihistamine sprays (e.g. Patanase, astelin) are great at nasal and eye symtptom relief too. Prescription nasal steroids are first line for allergic rhinitis as well.