I would recommend holding off on getting boots... you can go shopping for them over Parent's Weekend if you really want, but it'll be squad specific and you won't necessarily know by then whether you can have them or what brand you want.
You will (probaby) want:
-Food
-Probably underwear (although girls are required to bring their own to Basic... and I still use most of the same stuff I had then.
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-School supplies--especially notebook paper & 3-ring binders, decent pens, highlighter, stapler, scissors, 3-hole punch. You can print in the library or at your squad's printer until PW.
-Assuming you have long hair, probably a large "jaws" clip that matches your hair color. It's a life-saver in terms of hair health... I destroyed a good bit of my hair during basic due to constantly putting it up and tearing at it when I had to change from up to down and vice versa quickly.
-A towel (you can wait for this, too, since it takes up a lot of space)
-Pictures from home
-Headphones
-Your own running shoes. This is squad specific, but most will likely let you have them.
-Makeup! (Don't overdo it just because you can't wear it all summer... seriously, it's a stereotype that newly-accepted frosh girls look like clowns.)
-Sleep. Good luck with that!
Amazon offers a free Prime trial to college kids. Sign up ASAP and get your books that way if you can swing it, with the free 2-day shipping. Will save you LOTS of money and time waiting in line at the C-store.
You won't need a calculator, as the only one allowed for use during tests in most math classes is the so-called "honorlator," which you are issued.