I find the concept of storing up things to say when one goes out with DH interesting, but I don't understand it! I can burble along all day with the best, but when we are out together, or driving up the A303 (SO often) for example, we talk, and I don't mean me talking and him not listening; it could be about the projects we're involved in, or the kids - it' s an opportunity to have time together.
Having said that, I can see I need to be aware that we are off doing our own thing a lot of the time, so maybe we catch up on such occasions?
I said I'd still go into a pub or restaurant on my own if I wanted to, but again, on reflection, that confidence has come from being on courses and training sessions etc and having to do so occasionally. Used to get chatted up now and then, too.....