For the time being, without any more information, I would suggest yurts for shelter. They are supposed to be portable but some are not. If you want to buy them, they are relatively cheap, but you can also make your own. They can withstand earthquakes better than a conventional house due to the geometry, can be put on stilts easily if it comes to flooding, and will sustain high winds (75mph). If you want something to be fire retardant and highly wind (200mph) resistant, you will either need some high tech materials or look for more permanent structures.
What I meant by found materials would be scraps from broken and abandon buildings. Something if you were close to the city.
Take a look
here. It is in Canada so I doubt you want to ship things across an ocean, but it will give you a good idea. Not all yurts are portable.
Here is a traditional Mongolian yurt manufacturer in Australia.
There is also a good book on their design and construction
here.
If you want something more permanent I would suggest finding a good chunk of land somewhere and stockpile rebar and cement.