You could build a small hidden website, where you fill out a form (your data), then you'd have to let the server write a file... just got a better idea:
you could simply put up a wordpress blog (no external users allowed, only registered users), then you build a Zenno page, where you put your data in certain tags, eg:
<scrapethis>lawnmower</scrapethis>
<amountof>100</amountof>
etc
Then add a template, that visits your zennosite (login) every 5 minutes and scrapes the text and parses it for these tags.
It then puts it in a local txt file where the scraping thread finds it and works it through.
You could access it from everywhere then (even from your smartphone).