Rods, reels, line, hooks, weights, bait, groundbait, all the stuff normally used to catch fish. All non-essentials, just excuses for being on the bank.
Essentials: good long backed chair (prefereably reclining), umbrella to keep the wind and rain off, stove if you want fresh coffee, bottle of Ricard and fresh water otherwise, my little tape player and radio and earpieces, and grub. Or take Wol and let him cook for you! Get out there, pig out and sleep it off. No need for anything else.