All we feed our pup is food from the K9 freeze dried range, with occasional fresh bones, some natural yoghurt, krill oil (for omega 3), occasionally tiny bit of apple/nashi and blended steamed veg.
It's not cheap, but a maltese doesn't exactly eat much, so we are okay with the cost of it. Much better than commercial kibble, without endless hours preparing raw food.
I wouldn't keep the reconstituted wet product for more than a day - it is still raw after all.