Food Preservation

Preserving your own food is the point at which preparedness turns into self-reliance, and it is also the only area on this site where getting the equipment wrong can make someone seriously ill. The distinction below is not a matter of preference or quality. It is a food-safety rule.

The line between water bath and pressure canning

High-acid foods can be safely processed in a boiling water bath: jams, jellies, pickles, most fruit, and tomatoes that have been acidified. The boiling point of water is sufficient to make them safe.

Low-acid foods must be pressure canned. Vegetables, beans, meat, poultry, fish and soups fall here. A boiling water bath cannot reach the temperature required to destroy *Clostridium botulinum* spores in a low-acid environment, and no amount of extra boiling time substitutes for pressure. This is why a pressure canner is not an upgrade over a water bath canner but a different tool for a different category of food.

Follow tested processing times and pressures from the USDA Complete Guide to Home Canning or your state's extension service, adjusted for your altitude, rather than from a recipe without a source. Our guide to water bath canning sets out what it can and cannot preserve, and food preservation methods compared covers how the four approaches differ in cost, effort and shelf life.

The equipment that actually matters

The rack in a water bath canner is not optional: jars must not sit on the pot floor, where direct contact causes thermal shock and breakage. A jar lifter is the other item not to improvise around, because the alternative is lifting glass out of boiling water with tongs. Jars and bands last for years, but flat lids are single-use every time, which is the recurring cost of canning and the thing beginners most often get wrong.

What we could not verify

We do not physically test these products. Capacities, dimensions and materials are manufacturers' published claims from retailer listings checked on 3 October 2026. More importantly: nothing on this page is a substitute for tested processing times. Use the USDA Complete Guide to Home Canning or your state extension service for times, pressures and altitude adjustments, because those vary by food, jar size and where you live, and this is the one area where improvising carries a real risk.