Here's a couple of things I've tried...
This small coolbox has been great, it's only 9"x7"x7" and fits perfectly inside my topbox. The only problem is it's not waterproof so has to be sitting upright.
This food thermos is pretty good too and is fully sealled so doesn't have to be upright. It comes with 3 stainless dishes with sealable lids designed to carry hot or cold food around. It works, to a point. I don't like the taste of stuff that's been in it for hours though. It's great at keeping ice creams cold though and I like to use it on day trips. Pick an ice cream up at the petrol station and then ride out into the middle of no-where before stopping to eat it. People passing then spend the next 10 minutes looking for the shop!
The problem with both of these is the space they take up. On my last big trip I just used a plastic click-top container for my food. However, I ended up with food poisoning for 5 days after eating some dodgy salami I had in there for a couple of days. Not a nice thing to experience. I'll be a bit more careful next time. The coolbox does a good job of keeping your stuff cool even in hot temps if it's inside your topbox. That's without freezer blocks. With them it's as good as having an onboard fridge. It's relatively easy to freeze them overnight on a campsite but I don't usually bother with them. Maybe, after my latest experience I'll start using them!
If you're looking for extra room to stow your daily food consider tank panniers. The ones on my Serow are gasmask bags!
Or you could splash out on one of these...
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