Charcoal baskets. $15. Will save you money on briquettes and help burn more efficiently. I can't remember the last time I used my Kettle without the baskets.
The
Vortex gets a lot of use by folks. I don't own one, but it has me thinking about the possibilities.
Erik has you covered above on the basics and the fun stuff.
Forget the Slow n Sear. Forget the Smokenator (basically the forerunner to the Slow n Sear). Buy a couple fire bricks and the $15 charcoal baskets from HD or Lowes. Put the baskets against one side, end to end, or overlapping a little, stand the fire bricks on their long side, end to end, against the baskets to use as a heat block. Overfill the baskets with cold charcoal and wood, add a few hot briquettes .......bingo...same thing as both the above products. Heat flows up and across the lid into the indirect heat side of the chamber. If you want water, put a metal pan above the fire.
I also use a 15" carbon steel paella pan ($25) in my 22.5" Kettle. Don't get the 18" pan. It won't fit due to the handles (ahem......experience talking). You can get a 13.25" round cooling rack from
Amazon ($10-12) that first perfectly in the paella pan. I use that pan (and the cooling rack when smoking) in my Kettle for frying, pizza, hot smoking, slow smoking, etc. Heck, I even make paella on occasion. I'm the only one I know using a paella pan, but I consider it an essential accessory to my Kettle.