So I have a big ris that let sit on bourbon oak cubes for almost 12 months and I do this every year and use CBC-1 for recarbonation At bottling. This yr lhbs had only one pac of CBC-1 and it expired In nov and I bottled in March. I was skeptical of the viability of the CBC so I rehydrated and it proofed and foamed just fine before I added to bottling bucket. But here we are 2 months later where the bottles have sat in a closet at 70 deg and still no head, don’t know if the yeast wasn’t good at proofing the beer at 1.040 FG, it tastes like bourbon cherry syrup not good, so can I un cap and add some dextrose or sugar to each bottle to save/carbonate it. If so how much per bottle and do I run a risk of bottle bombs. Thanks for any help.