The hype these days is to stay away from plastics. Nalgene bottles are a no-no.
Try aluminum (coated with ceramic inside) or stainless steel. The really good ones are Kleen Kanteen or Sigg. They are pricey (about $20), but it'll pay for itself since they are reusable.
Regular plastic bottles should never be reused. They should also never be frozen, as they will leach out BPAs as they melt. Since they're not reusable, they're terrible for the environment.
Try the ones I mentioned. They're both reputable companies. The bottles are reusable, and they even have a screw-on lid that has a hoop to attach onto those hiking hooks.