There are a number of things you will need to bring with you to a tournament, below is a rough guide of what to bring.
INDOOR TOURNAMENTS
Water bottle, kit, towell, soap, toothbrush, indoor non marking trainers, knee/elbow pads, sleeping bag, rollmat, arnica cream (for bruises), nail clippers, disc, food.
OUTDOOR TOURNAMENTS
Water bottle, kit, towell, soap, toothbrush, studded boots, a good quality 2-3 season sleeping bag, rollmat, tent, torch, arnica cream, suncream, savlon, bug spray, nail clippers, visor, disc, food.