In praise of the Thermos flask

Apart from buying lunch a few months ago when we travelled away for a friend's funeral, I haven't bought tea, coffee or water to drink while I've been out for years. The reason? Well, you know the frugal word will be in there somewhere, but it's also because I realised it was a habit of convenience and now that habit is broken. The lunch we bought a few months ago also made me realise that now,