I love full-fat coconut milk, the kind that comes in tins, but never use much at a time - just a couple of spoonfuls here and there (eases my conscience about the fat content! ). But how long does it keep in the fridge, after I've taken it out of the tin and transferred it to a jar with a lid? I know it's more than the few days it says on the tin, but I didn't want to poison any of us! And how do you know when it's gone 'off'? Thanks in advance!