SHTF is an acronym that stands for sh*t hits the fan. This means that something drastic has happened, like a natural disaster, financial crisis, or a war has started. This term is generally used for when things go south quickly. The other acronym that is commonly used to signal it is time to pull out your bug out bag is ‘TEOTWAWKI’. This stands for ‘the end of the world as we know it’.
I agree with all except this one, “you should carry a water filter instead.” That water filter does NOT filter viruses which can incapacitate or kill just as quickly as can the bacteria it does eliminate. Carry purification tablets & a couple gallon sized double-ziplock baggies or an aluminum/titanium pot (multiple uses) or learn about SODIS instead. Why plan to fail?