Other rehabbers in our group will put formula in a shallow dish and put cheerios in the formula (rodent block would work, too). That way they get soft enough so they don't choke, but helps them move to solids at the same time.
I've not used that method, though, because I can't be there two - three hours later to remove the uneaten food so they don't eat spoiled goods.
A young man was picking up starfish and tossing them gently back into the ocean. "What are you doing?" a wise man asked.
"The sun is coming up and the tide is going out. If I don't throw them back, they'll die," the young man said.
The wise man replied, "But there are miles of beach and millions of starfish. You can't possibly make a difference."
The young man bent down, picked up another, and threw it lovingly back beyond the breaking waves. "I made a difference for that one," he replied.