Take your time, read the labels… date is a good thing to check. Remember you can always change feed if you don’t like one. I have tried many things out over the years.
I did it for a while because I had too… getting the proper stuff was hard and costly. You have to worry about a lot of things, I still fiddle with my feed but now that I can get it premade it is way easier. I supplement as I see fit. But in a pinch could I whip something up, yes… but would it be...