Well avmanansala, your situation is different than mine, My closest family is my daughter & Grandson who I could most easily access by bike, 8 miles.
Back to my original post, I think I will tell folks who ask, bicycle can't hall enough stuff, and the folks at the bike forum don't recomend it. 72 hours of water is heavy too.
Still for me,
if, bike looked like my option, all including spare clothes & 72 hrs of food would fit.
Not all disasters are what folks think, most only affect one house hold or one neighborhood, fire or many other things could force you out.
I spoke with folks in St George Utah found MTB the way to escape flooding from rains, and to access property afterwords, they could also carry the bike through the water when needed.
My buddy Danno's wife got the cops to kick him out of his own house, he comes riding up on his Canondale with a Shwinn trailer with his fishing pole and rifle sticking out the top, and stinky dirty socks hanging out the back.
Some day I will have a digital camera.