Useful during beast (or WISH i had):
blister bandaids - GOOD ones
LEATHERMAN <---so useful, I used it every day.
Sizzors (if on leatherman that would be fine too)
Mole skin (or bandaids like above)
Learn the knowledge before hand. Some people say don't... you don't HAVE to (i didn't..) but it will save you a lot of time if you learn it before hand. Esp: The core, the days, sco. def of discipline, worths battalion orders, code of conduct... etc
make sure you actually bring you cell phone/charger..it will be in storage, but you can use it during re-orgy week if you pack it.
nice watch w/ alarm
small alarm clock
motivation! (my roommates said to say that haha..)
An understanding that week 1 and part of week 2 is 100% mental. You will learn to understand that the will yell at you regardless. Just TRY to do the right thing, and you'll get by. However, no one is right all the time, it's okay. Just keep your head up and you'll do fine.
Once physical stuff comes around - just keep pushing yourself. So many people failed the APFT on day 3, but 94% passed...so you will get fit. However, if you can, prepare for RUCKS. If you can - start putting weight in a backpack and walking around. Once you get tired and wanna stop - start walking up hills. Seriously... this will prepare you mentally. I thought rucks sucked hardcore.
that's all I have!
That's all I can think of for now, if I get more ill let ya know!