I have to respectfully disagree with a couple of opinions given here.
Grit is a good idea, but most people don't have such smooth silky soil (rock free) that the chicks wouldn't be o.k. I haven't given any chicken grit for a year and a half, and i have had no problems. I'm not saying you should NOT give grit. I'm just saying it's not an absolute for everyone.
As to the two-weekers being outside. That's fantastic and the best thing for them. Mama hens take their babies outside on day two or three, and they're healthier for it.
I canNOT imagine keeping chicks under a lamp for six weeks. I know i live in the south, so it's different as far as temperatures, but chickens are not allergic to the outdoors; they're healthier for being outside....and so are you to avoid breathing all their dust. Also, most breeds are quite well feathered before six weeks.
I'm sure i'm a rebel to popular opinion, but i have never needed to keep chicks under a lamp past week two. They rebel against it and act better without the heat.
Also, they will LOVE the strawberries.
As to grit.....i'm not completely unreasonable.....a good rule to follow is that if you could mash the food between your tongue and gums, then the chick should be able to digest it without grit.
I respect everyone's opinions and experience here; i just don't think different people's ways of doing things should be presented as absolutes.