You might consider something else besides the miltary canteen cup. I love those and used one for decades until recently I weighed it and it was 9 ounces, by itself. That's pretty heavy. I replaced mine with an Olicamp anodized aluminum cup and a round nalgene bottle, that has no after taste. Just a small weight savings but every little bit helps.
Widget! Excellent suggestion, I never knew anything like that existed. Im locked and loaded to buy it off amazon for $14.53 (includes shipping) Is that a good price?