As you say, many people will be focused on questions like
“how can I remortgage the house so as to reduce my payments”, “how can I reduce my overheads by switching to a different home phone provider” and “how secure is my job”, rather than “how am I going to store rainwater”, “how am I going to dig up my garden” and so on.”
If we can address people’s very real economic concerns, we will be offering tangible benefit. What are some strategies for saving money? Get family and friends to move in with you. Find ways to cook with less fuel (solar cookers are only one of many strategies there), use less water (gray-water recycling with or without re-plumbing your house), ditch your car, share stuff, repair stuff, make stuff. How to live happily without x, y, and z. How to live more happily and healthily than ever on a fraction of the income.
The big question on everyone’s mind is: How can I get by once I’ve lost my job (or now that I’ve lost it)? Learning how to raise capital and form cooperative ventures that benefit the community (and are therefore worthy of community support) could be a life-saver. Also: how to set up barter networks, how to make community currencies work for you.