Another +1 on the boots. Learned this the hard way last november in Maine when I stepped in 33 degree water with non waterproof boots that were old, dog chewed, and had little to no insulation. Luckily I had on two pairs of socks, reg cotton and heavy wool. Also in my day pack, a dry pair of socks and some 'walmart' bags. Took the boots and all socks off, put dry socks on, a walmart bag on each foot, and the wet wool socks and boots back on and finished out my day. Learned the bag trick from a 'willy whitefeather kids guide to survival' book I read when I was I don't know how young.
Anyways: yes GOOD BOOTS and break them in. Next pick your ammo's and test them, learn them, pattern them and I did this in the jacket and with the backpack on I would be hunting with so I knew what to expect and how it would all feel. Depending on terrain, a map and compass and GPS if you already have one. I used my iPhone with the motion-x gps app, but printed a topographic and/or satelite map of my hunting area from google and kept it in a ziplock bag. Compass can range from $1.99 whistle, compass ect combo to $100+. I recommend (though have not yet bought myself) around $10-$15 for a decent compass as it can be the most important piece of equipment.
I would say all other equipment is climate based. I had a whole backpack filled with just the minimum of what I thought was a good idea for being in Maine woods in November. But 95% of it was stuff I already had or was able to put together from basic supplies. A few examples: bic lighter, heavy duty tin foil (3ft folded into a 4x6 square) ziplocks, walmart bags, a large black trash bag, emergency blankets (2, one for me one to make shelter), paracord (50'), other misc small rope, a cheap fixed blade knife, couple other knives, small fishing kit (hooks, lines, weights and a lure and or fly in an altoids can), dry socks and underwear, couple flashlights (even little keychain led's), water bottle, crystal lite mix for electrolytes, chewy bars, trail mix, and first aid kit.
Thats all I can think of for now but again most is area / climate specific. Hope this sheds some light on what can be done on a very limited budget but still being very prepared. Good luck and have fun.