I started a batch of Vimto turbo cider yesterday (22/01/23). It's currently very cold in the UK and I'm concerned the low temperature will negatively impact the brew. I've got the fermentation bin on two towels to keep it off the cold kitchen tile floor. The thermometer strip on the bin is showing 14°C at 1PM but this will drop overnight.
How would I keep it above 10°C overnight without an electric blanket? I've thought about hot water bottles but have read that spikes in the temperature during the fermentation will cause problems with the yeast.