Riverswild the woodchips you buy by the bag for smoking fish work great.Take those same chips and wet them in the salt water the same time you get your shrimp.Your shrimp can then be stored in the frig,as for how long they last that depends on how much you change the bedding material.I used to get my own shrimp but since I'm primarily a weekend fisherman the time and effort wasn't really worth it.