No worries about concerns and expressing doubt, I am also learning as I go, and have so much more to learn too. Definitely no offense taken.
From what I've read and researched, chicks do need grit, and yes, before they go outside. I'm not sure how your first batch did it without grit, but I was instructed in the "Baby Chick Guidelines" notes that were given to me from when I bought my first batch of chicks (plymouth rocks) at the store. There was a checklist of things to provide for them, and grit was one of them. We bought a commercial packet (grounded granite and it was red in color) to keep things simple and added it to the food, like humans seasoning food with a tinge of salt. I thought it was the store being a strong advocate to buy 'this' and 'that', to increase their own shop profits, and doubted the purchase of grit, but then later on, I read many other books and online message threads that said that it was indeed necessary, so I guess, it was wiser for us to err on the side of caution and bought the grit.
Included in this list was also electrolytes. Again, we bought it together at the feed store, with the chicks and all, it is a yellow package, but I have also seen it in other colored packages. Refer to this example from My Pet Chicken
http://www.mypetchicken.com/catalog/Chicken-Health/Vitamins-and-Electrolytes-p179.aspx
The check list instructed that for the first couple days, we should just feed cool water but after that, we can sprinkle the powdered electrolytes into the water (till it turns a light yellow shade) and then alternate between plain water and electrolyted water after that.
In addition to this, I ordered something extra for my chicks called Gro Gel, another online hatchery calls theirs Grogel Plus B. It is basically a powdered mixture which you add water to, and it forms into a green gel. It provides immediate hydration, nutrition and micro-organisms such as probiotics to jump start the digestive system. I think this is just extra nutrition, but my chicks thrive on it, and ever since then ordering one packet to try, I have ordered more, and every batch of chicks, I get, I feed it to them.
All the best to you and the chickies.