Re: How many bottles do you travel with?
Ellada - I've had one taken by a border guard (personally I think she just wanted it for herself )
There was maybe 50ml left in it, and that's rounding up, but because it was a flagon that said 250ml on the bottle they confiscated it. I think you're OK so long as you keep the bottle below 100ml - and they apparently go by the label on the bottle, regardless of how much is actually IN the bottle...
I think Nikosculpture has the right idea, I only ever travel with one perfume and I always keep it in my hand luggage so it can't get lost. But I don't alternate day and night fragrance and tend to stick to one perfume at a time anyway.