I keep mine in the freezer. Then it stays in the cooler while on the boat. If it got too runny, I kept a ziplock bag of shredded paper I would mix in it. Flour or corn starch would work as well.
Order some of Stubby's cheese bait, it holds up to the heat pretty good, but he recommends keeping it on ice while fishing.
Kirk Long (Kikr) March 4, 1959 - June 19, 2009
I guess the Lord needed a fishing buddy more than me.