Hi ,
I read from the article, drosera still can survive if they didnt trap any insect . The plant will use sunlight as their source to keep alive.

.... Of course, if you feed them, they will more do well. I think all CP keeper want their plant nicer and bigger. heheheheh i do as well

You can buy them those bread worm (brownish )but small type. they are reach of protein. So do not feed them much at one time. Your plant cant take it to digest them.
Flowering will always take a lot energy from the mother plant. Your plant will start getting weak if they boosting up flower.
i had experience before with my D.adelea where do not produce the dew. it take me one month to monitor what wrong with my plant as well. What i do is try observe my plant's leaf is growing well or not. Because, it might be the bug disturb your plant or eating the leaf


. If this is not happened, i will repot the plant and change the media. do remember always monintor before you do it ya!
hope this is help~