Camping tupperware kit ?

Small lock and lock containers from most supermarket chains and small liquid containers from Boots', Lloyds', etc., travel sections.

Guy Hurst wrote (see)

Or the little Nalgene bottles, which last virtually for ever -- at least I've got some I've been using on trips for at least 15 years and they're still as new.

primus:
http://store.primuscamping.com/camp-kitchen/beverage-food-containers/meal-set-red/
 Also airline spirit bottles for tabasco/oil/vinegar etc.

HTH

Uncle Bob at Backpackinglight.co.uk always has plenty of stuff for this.

"Ah, they won't be BPA free then, Guy. How are you feeling?"

I was meaning the Nalgene HDPE bottles, which never had BPA in...although I'm also still using a Lexan bottle of similar vintage which presumably does. I've had loads of sleepless nights over it, but only when it rolled under my Thermarest. 

Guy Hurst wrote (see)

I was meaning the Nalgene HDPE bottles, which never had BPA in...although I'm also still using a Lexan bottle of similar vintage which presumably does. I've had loads of sleepless nights over it, but only when it rolled under my Thermarest. 

now there's a thought

but i'm concerned as to what Bedouin was doing in a pound shop.

Looking for a penny sweet?

Sugar, salt, etc.  Go to your nearest takeaway and help yourself to a stack of single use sachets.  Store in plastic bag.

Washing products: use sample bottles, or hotel shampoo/shower gel bottles.

There are plenty of opportunities if you look around at recycled packaging.  Don't try putting wet food in anything that's had strongly franganced products in, though; you're unlikely to be able to remove the pong from PP or HDPE.  You may have better luck with PET.