Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Kate,
You're doing a fine job. I took a look at the vitamin/mineral block you mentioned and while it looks like a good thing, I am skeptical. First, vitamins left out in the pasture are going to be easily destroyed as they are exposed to air, water, heat, sunlight, etc. And, there's no way to know exactly how much of the minerals they are consuming. So, it would not be something I'd recommend.
Instead of Accel and Bio-Flax, why not consider a complete supplement such as Glanzen? This is made by the same people who make Bio-Flax and if he likes the flaxseed meal, he'll definitely like Glanzen. That way you would combine two supplements into one.
About bagging the supplements in advance, as long as they are in a cool, dry place, it is fine. But, in the summer, it would be too hot to store supplements in a hot barn. So, an air conditioned room is preferable. But this time of year, depending on where you live, may be fine (say if the high temperature does not exceed 75 to 80 degrees inside the storage space).
I would not add apple cider vinegar in advance. The acid will destroy several of the vitamins (minerals cannot be destroyed). And, it would be very messy to bag supplements with a liquid.
So, I hope this is helpful. Thanks for writing and for you enthusiasm about this site. Glad to help!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO