A lot of ISPs allow you to have some web space to set up your own website. Often, you can even set up a simple web server on a laptop or PC, and just give your friends access to it. If you host on your own box, make sure you have a decent firewall in place so you don't expose yourself to hackers.
Export your game to HTML5 and then just copy everything as it was placed in your directory to your web server's directory. If you get a website with your ISP, they probably have a FAQ that can tell you how to copy web pages over to their servers.
As far as making an ISP's web space visible to only you and your friends, you will need to check their FAQ and / or talk to customer support. It's different for every service.
There are also several free drop box like services out there that may work for your needs.