What to leave out when out of town

 I have two cats who have more or less stopped eating dry food after they had some dental problems (with extractions).  They are happy on a soft food diet but I was hoping to be able to go out of town for a couple of days and I'm not sure the best way to leave food for them.  I obviously can't leave soft food out, any idea if it would be safe to leave out some hard food that has been softened with a bit of water or something?  Any ideas are greatly appreciated!

A cat sitter?

Feed one meal of wet food.  Leave ice cubes of wet food for a few hours later.  

Or have a cat sitter come by twice a day.

We recently moved to a new town and don't really know anyone yet, at least nobody we really trust.  I was hoping to find a semi moist food but no luck of course, even online.

There are some places online to find pet sitters. I have also noticed it is cheaper to board a cat than a dog.

I have seen food in packets at the store, not sure what that is.Like foil envelopes. Good luck. I think the ice cube thing might work.

The ice cubes are a good idea. They also have automatic feeders for wet food.

Semi moist has high sugar content.

Freeze the food and let it thaw as @tdonline has suggested, or go for the automatic feeder @KoolKatz has mentioned.

But do not wet the dry food and leave it out. Dry food has a higher bacterial load. When you wet dry food and leave it out there's a much higher chance of bacterial growth and subsequent poisoning.

Seeing as OP wants to leave for a few days and doesn't know anyone they trust to come into their home, I'd just board them. Like another poster said, cats are typically cheaper to board than dogs. Plus most places give discounts when boarding more than one pet. Boarding would allow you to continue feeding wet, make sure the cats are checked on each day and that they have a clean box available.

They're in a new home and then they're going to be boarded too?  I would worry about cats falling ill due to stress.  

I would research for a bonded and insured pet sitter.