Avoiding DTs

Browsing older posts and noticed someone mentioned the surprise of other walkers when he produced a bottle of wine. I've been using these for car-based camping http://oneplanetwine.com/range/ - from the cellar door or occasionally much more cheaply from Graysonline. The white freezes very well if one's freezer is cold enough - my chest freezer works, the freezer part of the fridge doesn't. Disappointingly I can't see their 250mL size any more - of course, that was perfect for an overnighter.