Single-use plastic is a huge problem in Peru. We really encourage you to avoid adding to this problem. Not only is the percentage of plastic in a bottle that is recyclable very low, but the vast majority of bottles simply do not make it to any recycling plant. Even if they did, something like 80% of the bottle would still be going into landfill due to it being made from non-recyclable plastic.
This is an interesting video on the subject. While the water in most of Peru probably is not drinkable as is, there are many options to single-use plastic bottles of water.
Whilst on tours with us we provide you with purified water. Either from large 20 litre bottles which we take back to the water company to refill. Or on treks and other camping trips, with water that is filtered and purified by our cooks.
Very few hotels have water filters in the rooms, the vast majority do not. Sadly most seem very keen on selling water in single-use plastic bottles as they make money on it. So, we really recommend you take it into your own hands by bringing a water filter bottle. This allows you to have clean water everywhere- from hotels, to airports to the outdoors. The money you save by not buying water in hotels, airports etc, will soon pay back the cost. And they will last for more trips afterwards with most offering replacement cartridges. One company we like is Grayl: