You just have to realize that they’re going to preach zionistic so tune out when they do that. Even the separate tours meet other tours and sometimes stay in the same motels. Best to go with friends so you can stay “on track”. And have fun! And extend your trip if you can – it’s worth it.
As far as taking things along – just the usual clothes, bathing suit, HAT/CAP = very impt, backpack…