Peroxide is good for cleaning out nasty wounds- lots of pus, dirt, etc. I usually dilute it to half saline, half peroxide. It is toxic to newly granulating tissue, so once the nasty wound is clean, you should not keep using peroxide. After all, initially, you aren't as worried about healing tissue as you are about getting all of the yuck (yes, that is a highly technical medical term!) out of the wound.
After peroxide, I always rinse the wound with saline or sterile water. Saline in a syringe squirted into the wound at pressure is a good way to remove wound debris. I keep sterile 60 cc syringes to use for wound irrigation. (you can buy them on Amazon- get them with the luer tip rather than the catheter tip.) Once the wound is clean, I continue to clean it at future dressing changes with saline. I read once that both peroxide and betadine need to be diluted to 1 part per hundred with water to make it non-toxic to new skin cells. Do not use peroxide in deep wounds for several reasons- gas formation, damage to deep tissue, etc.
I have to admit I would NEVER pour alcohol into an open wound, no matter how dirty it may seem. I read all these novels about people pouring booze into gunshot wounds and it just makes my skin crawl! Alcohol is good to clean the equipment you may need to use (needle, tweezers, etc), and it is good to clean the area around the wound (kills germs on the skin that could contaminate the wound).
When I use my canner, I fill any empty space with jars of water. I leave the jars of water on the shelf for times with no power unless I need the jar. Would that water be considered steril?