The Ohio State University CFAES Extension Food Preservation Team Q&A cards:

• I can’t find canning lids (flats) anywhere! What can I do? 
• Is it safe to can in my electric multi cooker? It has a button for canning.
• I have a smooth cooktop stove. Can I pressure can on my smooth cooktop?
• Tomatoes are already acidic. Do I really need to add more acid to the tomatoes when I can them?
• I have a canning recipe that doesn't call for processing the jars. Do I need to do so?