Well, I went to my BMQ a year ago so not much should have changed.
-Civvies, bring two sets, maybe two and a half. You're bound to buy some in Montreal or the nearby mall when you get your weekends
-Swiffers, go ahead. If your staff don't like them then stuff them in your civvie lockup stuff and use them on weekends after week 4 or whenever you get access to it.
-Avoid large amounts of "junk" to come with you as it becomes a large burden if you are fortunate enough to move to another floor
-White erasers. Great for scuffs on floors and it won't stri the floor like some of the 'I-have-a-better-idea' cleaners that can be found in the cleaning closet.
-Shaving cream goes back INTO your locker after using it. Same for shampoo and anything else under pressure or squirtable. You will find your instructors may have become Paris street artists if they didn't join the military.
There's a lot of little advice posted around here if you look on what to bring, what to do, what not to do and so on. Everyone's had their own experience from physically demanding instructors to mentally demanding instructors. Big thing to have with you going into Basic is determination. I've seen a lot of my fellow candidates drop out through the entire training cycle because they believed they couldn't handle the hardships they were facing. When you're done it's all easier. If you're in the Navy life becomes pretty slack according to my Naval friends, and same with the Air Force. A lot of people thought along the way that their job was gonna always be like the 'hard day' they were having and gave up. BMQ is easy, it's fun, just do what your told to the best of your ability. Work with your team because they get you through it just as much as you get them through it. The life after the initial training phase, be whatever MOC you're in, is far more enjoyable than anything civy land has to offer.
-Spooks