Throat infection. STRICTLY NO HOMEOPATHI

Hello doctor I am 57 years old. Having hypertension (2.5 mg tab a day) , general cholesterol issue (10mg tablet a day) and occassional IBS.(managing with flaxseeds). I am 74 kgs, 5.8 feet height. I WALK 8 TO 10 KMS A DAY IN ONE GO. Now the issue is. NATURE Since 25 years I am addicted to packaged drinking water. so even a ounce of ordinary water causing me immidoate (just in 15 mins) throat infection / sometimes with cough. AND SAME ISSUE IS WITH MAX OF MY FAMILY MEMBERS. So we use packaged water even for cooking. And I don't eat any cold or wet food outside. CURRENT ISSUE from this lockdown  the water was not much good which we are getting since 2 months. So I started drinking hot water. But when o drink plain water (it too local packaged water) I am getting mild throat infection / mild throat congestion.  But no mucus or breathing issues. I am managing with plain steam inhaling and betadin gargle. please suggest some lozenges / medicine