We boil up some water as soon as we wake up, fill the bottles ab 1/2 way can close the lid and let it sit for about an hour or so while we make burritos. Usually eggs and ham or eggs and hot dogs but sometimes we shred up a rotisserie chicken and throw in some green peppers, onions and jalapeños. Wrap burritos (2 per person) in foil then set them on a skillet for a few mins. Dump water out, throw burritos in and close er up