I bought one and had great fun with it.
When we'd used up all the expensive cordial flavours that came with it we used ordinary squash instead, and then my eldest son and I had a go with other things instead of water.

Pop - SodaStream blew up and drenched us and the kitchen.
Cold tea - SodaStream blew up and drenched us and the kitchen.
Milk -SodaStream blew up and drenched us and the kitchen.
etc

You get the idea.
(Juan Quar is clinging to her front teeth on, Wed 4 Sep 2013, 10:12, 1 reply)

I think you were doing it wrong, if it blew up.
Friend of mine carbonated milk in his SodaStream - he made the mistake, so we wouldn't have to.
( monster munch person, man, woman... camera... TV?, Wed 4 Sep 2013, 10:16, closed)

How the hell can you do it wrong?
Fill bottle, insert tube into bottle, stand bottle in Sodastream, close Sodastream, press button on top, Sodastream blows up. Carbonated milk everywhere.
(Juan Quar is clinging to her front teeth on, Wed 4 Sep 2013, 14:11, closed)