How would I say this in Japanese? 

"I should have known better"/"I should have been more prepared" and "We often take things for granted"

Would something like.."私はもっとよく準備できはずだった" be correct?

And I have no idea how to begin to translate this but how would I say "I wish such a facility existed in my country"?

And something like "we often take things for granted"?

Would really appreciate any help :)