Back when I was heavy into reenacting during the 125th cycle, on the way to an event, I tried to get more into the "mood" of the period by listening to tapes (no cds then) of period martial music (drums fifes, etc) and music of the time. I'd try to read source accounts for the week prior and period newspapers to try to pick up on the speech and vernacular.
As for bathing, I'm sure there were those who avoided ablutions, but from what I've read, they generally did attempt to deal with hygiene when possible so deliberately going stinky might be an anomaly for camp life. Of one example in Four Years Under Marse Robert, Stiles relates a time when he and another soldier were down in a river bathing and washing clothes at the same time. Stiles says that while washing clothes and themselves, they were discussing religous matters regarding eternity and destination. The fellow he was with was having a hard time with his faith given what they'd been through. Stiles relates that he later spoke with the soldier and inquired again about how he felt and got a positive response. A good thing too, the soldier took a round shot to the head in the next engagement. But the impression I came away with in the account was that bathing was not avoided when in camp. Stiles is another source reflecting on the intellectual side of life then. He was a Harvard man, going into law when the war started and he left NY to enlist in the forces of his home state, VA. He enlisted as a private and ended the War as a major. Much of what he writes about is camp life in various aspects. As an educated man, he is a wealth of information regarding the intellectual life of the Confederate soldier. He points out that of the battery he was with, many were college and university educated and the intellectual "scene" was every bit as lively as any campus.
To make your impression more believable, read up from first person sources wherever possible, especially about camp life as they spent far more time in camp than fighting. Research can be quite entertaining. If your impression is of a person with some education, reading was very popular. Gambling was widespread and it wasn't just cards or dice. There was betting on cockroach (and lice) races. I've read of scholarly debates among educated soldiers over the merits of very mundane subjects like how to fry chicken. I'm sure you'll find the debate as much fun to engage in as for the spectators to watch. I read of another event where a pet chicken had died and was given a full military funeral just prior to the pan. Imagine putting that one on for a group of spectators and it would be entirely in character. So use your imagination with respect to period and I'd say you may well recreating the camp activities of bored soldiers.
One further comment, the guys we used to call the "hyper authentics" would go to great lengths to defarb and go period, but what I saw them doing didn't square with first person source materials. They may have looked the part in their kit, but the person wasn't believable because of their actions in first person. Just like war today, the WBTS was long periods of boredom punctuated by moments of terror. We tend to lose sight of the boredom and focus on the terror side and forget that those guys were just as human as we are and they made the best of the situation they were in.