I usually use 3 rods, dependant on rules obviously.
Even on a 2 rod water I have a 3rd rod set up ready. It means I can reel one in, attach a fresh PVA bag to the dry spare rod and cast at showing fish, or to the feature and then sort out the reeled in rod at my leisure.
A bulk spool of line is usually about right for 3 reels if they are loaded correctly with backing if needed. As for hooks and materials etc, I buy a spool, buy packets, so have plenty of rigs made up. The licence cost is down to you, but for the cost of it, its worth it.