Hey sigurd!!
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Welcome to the forum - I thought that Beccarose had some good advice. And anyway, maybe this is just one of those - everybody let it go & let's start afresh. Here's the things I can help you with:
Saltines - everybody has their must-have item for sure! Mine seems to rotate around a bit. You've gotten some good advice on the Saltines - the Dorianos are kinda similar, you can buy them for sure at Sainsburys & perhaps other supermarkets as well, but they are kind of too thick & not that salty IMO as compared to an honest to goodness Saltine -- though they might do in a pinch. At least at one point & I've not looked/bought them in awhile, Morrisons was selling something as near to a real Saltine (without being a real Saltine) in a pack of crackers labelled as Delsa. Here is an old Food Talk thread all about the love of Saltines:
http://talk.uk-yankee.com/index.php?topic=66241.0 
Streaky bacon is the one you want! You can buy it either smoked or unsmoked - try both & see which you prefer.
A few places here do offer refillable/soda fountain drinks - one is
Nandos - great spicy chicken too! Also I think you get free refills at Subway as well, but I've not been to one in awhile. There may be other places as well.
Can't remember seeing where you said you are living? Also what is your second language, out of curiosity? My husband works in IT here - but we are up north.