Since my infection and hospitalisation in January which scared the s*** out of me, I've made a lot of changes and introduced new things into my diet. Apart from stopping alcohol altogether which I've done, there are three things I think have made a big impact: Echinacea and Elderberry tincture (Neal's Yard, can order by phone, not cheap), Manuka Honey (most wholefood shops, also not cheap but just a teaspoon a day is enough) and my Nutribullet blender/juicer.
With the Nutribullet which pulverises everything you are guaranteed getting all you need in one drinkable meal which is also delicious (and no, I don't work for them and I'm not getting commission )
It's also not that cheap (£80 - 100) but has a really powerful motor which means no bits. It's also fun to experiment with a whole range of possible ingredients and if you do a bit of googling before you buy stuff you know that it is doing your immune system a whole lot of good. If you have appetite problems as many of us do, believe me you'll like this.
My breakfast nutriblast this morning: honey,melon, kiwi, blueberries, kale (I hate kale but it's fine in here),cashews, coconut oil, fresh ginger, fresh lime juice, flax seed, handful of oats and non dairy milk (koko). Blast 20 seconds...