I have a client requirement to manage data locally on an iPad with no network connection, any advice would be welcome please…

1) No network connection when the iPad is out on site.
2) Cannot install a native iOS app.

Preferred wrapper:
1) Locally installed HTML5 file.

1) The HTML5 page, presumably using JavaScript, must be able to save form data to the iPad on a button click event.
2) The User needs a facility to subsequently upload the data to a central web server, either with network connection or by cable.

What is the best way the achieve this ?

Thanks very much..