I don't disagree, but I figure the removal of plastics from my diet is like Team Sky's "marginal gains" philosophy... i.e., a lot of little reductions in plastics will eventually add up to a bigger reduction (or so I hope).

Since I live in the northern USA and ride indoors (Zwift) about half the year, I've decide to only use stainless steel bottles while on my trainer where steel bottles are a lot less inconvenient because they're just sitting on my trainer desk. Campmor has the Camelback Podium stainless steel bottles for 25% off ($30) as of my typing this.

**** UPDATE ****

The CamelBak Podium stainless steel water bottles are not for weight wearies! Each bottle weighs about as much as my bike.