You can’t sanitize something that’s dirty. First you need to clean it properly with soap and water. Iso alcohol is toxic TO DRINK. spray it all you want.
You should wash your hands with soap and water for 30 seconds, look up on you tube for a video on how to do it properly. Yes there are right and wrong ways to wash your hands.
You should boil all water you will drink. Ensure all food is cooked to a temp of >75C internally. Dont eat food that can’t be, like salad or cut fruit. OK to eat fruit with an intact peel you remove yourself like orange or banana. Clean the unpeeled fruit and your hands with soap and water first.
If you are able, get vaccinated for all applicable disease.
Keep some oral rehydration solution (ORS) on hand in case you get some sort of diarrhea, which you eventually will. It can help you get better from a milder case. https://www.wikihow.com/Make-an-Oral-Rehydration-Salts-Drink-(ORS)
Ultimately the problem is collective, you are likely to get all kinds of infectious disease until the sewage problem is resolved for the whole community. There is little 1 person can do in such a situation to fix it only for themselves.
You can’t drink it.