Clean shirt ... dainty sips of watered-down cordial.
Of course, pouring's a little tricky if it's your first time. You're bound to miss the cup every now and then.
I'm not sure if pouring cordial directly in your yoghurt counts as 'good manners'.
And drinking straight from the pot is likely to get disapproving stares if you're at the Ritz.
But luckily I'd banked on mess and we were camped out on the verandah for our party. And watery mess is part of the fun!