You will be fine if u go with rested buff and anti poison potion ( and health potions for emergency ) , sword or mace are the best in swamp
Try to make your trips in boat ( first karv and build fast the longboat ) ,make a portal in the edge of a swamp or in the shore for emergency too
For food try carrot soup / deer stew / minced meat souce , after you get swamp ingredients : turnip stew / sausages / black soup