The only thing we take is salad cream (also have to take it to Europe), redbush teabags (cos I wasn't sure whether I could buy them there and now I still can't remember!), rice milk next time and gluten free bread, biscuits etc. We don't have a problem with ordinary bread, instant coffee or washing powder.
Everybody has different tastes and people can try themselves or take stuff just in case. Personally I like to try before decideing I'm not gonna like.
Must have taken a long time doing this post which will be useful if you're on H27 for shopping and something to think about for everyone else