if single sided discharge-may be abcess tooth or decayed...
but more like food probable causation/aggravtion--diet must be high quality (fresh 'kill' best--home prepared next choice)....
male?female? - female
spayed?neutered? - yes
100% house cat?how much get outside? - 80% house cat.
where live ?country?city?..etc - country

what condition of hair? poor
what condition of nails? ok
how much 'clawing ' observed? normal
what noticed concernig thirst? slightly more than normal, especially after eating dry food.

what illnesses in past?when? how treated? none - never been ill, except for now.
what vaccinations?when? annual booster June 2004 also antibiotic jab for the current problem.