DOH!

Once i experimented with the sachets i left them sitting for a couple of days.... only to discover they have all started leaking!

Good job they were left sitting in cups of that could have been a nasty surprise!

So whats happened?

1. I havent done it properly
2. There are holes or gaps in the seal
3. A water tight seal isn't achievable with this method

Either ways it's back to the drawing board!