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What you want is an Olicamp cup. It is SS with folding wire handles. Campsaver.com used to carry them but I could not find them on their sight. Perhaps you can do a search. They are a tight fit and I have noticed that newer nalgene bottles are slightly bigger.
Found it and they are on sale.
http://www.basegear.com/space-saver-cup.html
The amount of chemical bleed from the plastic is in parts per billion and even too low to harm infants. I will try to post the report if I can find it. Warming the bottle for formula is not the problem. The tests were with boiling water. This is just media ignorance and granola chrunching hemp wearers alarmism. To stay on the side of caution until a new report is released, keep it away from pregnant women and infants.