I just went to Ireland and had no trouble taking my probs and stuff. I even had a bag with a few ice cubes in it with the probs and they let it through. I just put it with the liquids, that they view seperately. Can't help you with the water. I know it was easy to find in Ireland. Are you going on vacation, have fun!

Haven't traveled overseas since being in treatment, but am going out of the country in a couple months. When I travel in the states I just call the office and Lynn emails me a sheet to carry with me that allows you to carry your water, pros, supplements and food through security. I am more nervous attempting this through customs, but I am sure it will be fine. The cod liver oil, I am not sure, but may need to be an unopened bottle to get through security. This I know is the case with the water. They make you open it in front of them, then they test it before they send you on your merry way. Allow yourself extra time just in case, because this can take sometime, if a supervisor is not readily available. Hope you have a great trip!:) 

I've travelled to Germany many times although admittedly not with probiotics. From memory though they're not that strict with stuff like that compared to Australia where I live - who are soooo strict about food types that you bring in. So you should be fine with probs. As far as spring water goes. They have tons of amazing quality spring water there. Vittel is one I used to drink there a lot. Otherwise if you want to ve super safe they have Evian everywhere there so you can get that too.
Have fun!