BFD didn't say it had to be light, but packrafts are tough to fit coolers into.

On water, bring some alum (it dissolves best in hot water). It'll settle the sediment from your water so you can...

Pre-cooking can work great, particularly for raft trips, but the meals often aren't light. Also if you do it wrong you can end up eating bags of chicken mush. Or beef mush. Or mush mush.

Light, not bulky, not freeze dried, and no boiling water? Enjoy your gus and granola bars. Otherwise, wendigo seems to have you covered.