You can buy a water bath canner (pot) from Walmart for about $ 20.00. The jars you can also get at Walmart and various grocery stores. You also need lids & rings, those can be purchased separately. The lids you only use once. I’ve done canning all my life, if there’s anything else you need to know, don’t hesitate to contact me.
I wouldn’t buy the generic jars Wal-Mart sells. I bought a couple boxes a couple of years ago, and nearly every one of them had hairline cracks in them. Made in China, of course. Ball brand canning jars are still made in USA. They last literally, forever. I don’t know about Mason jars. When I was a kid, my mom saved mayonnaise jars and used them. We never got poisoned, so I guess they were safe. She didn’t have a pressure canner, either. She canned tomatoes, corn and green beans using the boiling water bath method. I know you can open kettle can tomatoes without processing, AS LONG AS THEY’RE NOT LOW ACID tomatoes. But that’s tricky, with all the “new and improved” tomato varieties.