You may also be aware of terms like BPA which are bad for you. But you may not have heard of other terms like pthalates which are also harmful chemicals not fit for human consumption. The composition of the plastic itself contains pthalates, so at times of chemical (even with the contents), heat or UV exposure, it certainly is quite possible, even if remotely that pthalates can leech into your water/beverage. There are standard pthalate leech tests in distilled water, acetic acid and rectified olive oil in laboratories that routinely confirm this.

2. PP - Poly Propylene

While these are far more safer for regular use and are typically THE standard material used by all name-brand companies like Lock & Lock, Tupperware, Rubbermaid, Cutting EDGE, Oxo, etc. they are not as widely adopted for bottles largely because they aren't as transparent, clear, and therefore beautiful compared to PP based bottles. If it were, it would definitely have been commercialized far more. If you're buying plastic bottles for home/regular use, i'd definitely suggest you take a look at your bottle when purchasing and look for Recycling Code 5 with the letters PP on it.

For regular use, I'd definitely suggest a PP based bottle as both safe, and very economical to use with the only caveat being that it may not be as pretty and clear/transparent as your PET bottle.

3. HDPE - High Density Poly Ethylene

HDPE and some variants are typically used in (for example) milk packaging containers. They are also fairly safe, with no known major issues whatsoever. They aren't very popular though because their physical properties vs PP in terms of thermal stability, etc. are not thst great and are definitely even less aesthetically appealing as compared to polypropylene bottles. I'm not aware of any major bottle manufacturer that has commercialized HDPE for making bottles, sippy cups, etc. for general/home/regular consumption and its unlikely that you'll come across them. Your bleach containers, oil canisters, etc. are also all made of HDPE or related variants.