Food grade diatomaceous earth won't hurt an organic certification but anthelmintics (worming meds) aren't organic.
I don't know what is in the 'health pack' so I can't help you there.
The feed needs to be certified organic. If
Tractor Supply or another feed store nearby carries an organic starter feed, you want to go with that. Then at about 20 weeks or when they start laying, you can switch to an organic layer feed.
You can't feed scratch unless it is certified organic because most grains aren't organic and likely GMO.
If your birds are free ranging, they can't be on land that has had herbicides or pesticides applied in something like 10 years.
Lots of people worm on a schedule but depending on where you live, they may never need worming. Warm wet climates are much worse for worms. I use a probiotic powder called Gro2Max that helps ward off any internal parasites. I've only wormed one chicken in my life. A healthy chicken can handle a light load of parasitic worms with few ill effects.
I have used an herbal wormer from time to time but not often.
When I've had fecal samples read, they had no worms.
