Store and access data offline from a website

What is the best/easiest way to store data offline? I have a website that I only run local (it's just for personal use) so I am not using any php or sql. I have a lot of posts containing a date, a time, a description the consist of a lot of text and a few of them contain an audio file (there are very few audio files so they may be stored separately from the rest). Now I want to make a website which can show these posts at request, but since I am not using either a server or a database I'm not sure how to store them. Use of any kind of framework or library is allowed, as long as I can use it without an internet connection.