yes but, pop tarts look like hard tack....
The correct answer is the rations which would have been historically issued at the time. This is about the history, right?
The 137th NY performed way, way better than the 20th Maine at Gettysburg. They just didn't have a self promoting blow hard of a Col. leading them. Maybe you should look up the history of the 83rd Pennsylvania too, they make the 20th Maine look like the rookies they were.
There are some very good books out there about the fighting on Culps and Lower Culps Hill. Vincent's Brigade had nothing on those boys at the other end of the line.