Brewed a porter today and I'm really excited. It was a good brew day overall. I avoided a boil over by adding Fermcap when I noticed everything rising instead of adding it right at the beginning. I did have one boil over when I added the 5 min. hop addition and had to run inside real quick. I thought I was okay because I had lost enough volume during the boil. I couldn't chill outside because my hose was frozen, so I had to bring everything inside to chill. OG was about 1.052-1.054. It was hard to tell because there was almost a small head on the sample in the wine thief.
My question: I bought a couple of BetterBottles last weekend and figured that since the biggest one is 6 gallons, and this is the highest OG I've started with, I'd better start with a blow off tube. I bought 5/8 inch tubing and it seemed to fit just right on the bung that goes into the BetterBottle. But now after getting everything set up, I'm realizing that it is almost a little too big. It wants to slide right off. I can position it so that it stays, but it comes off fairly easily. If I have a blow off, will this be okay? Should I just put on an airlock? I don't have a HBS anywhere near me to pick up some tubing. Coudl I get tubing for a blow off at a store like Menards or Fleet Farm? Does it need to be food grade? Sorry for the long post and thanks in advance.