FlippingTop
Bluelighter
Just ask for an oral syringe, say it's for measuring out a baby's medicine dose if they ask any thing (which they won't, it's just a syringe).
got 3 oral syringes from chemist, only 20p each or something, 5ml ones, they are hard to measure and dont go far down into the bottle, and when you squirt it out it squirts at some force and sprays a bit, bit annoying, but better than nothing.