Cheap bottles use phthalates and untested BPA replacements. Here is what you are actually drinking from a CA$5 bottle and the safer alternatives at CA$28.
PET bottles in a hot car should be discarded. Antimony leaching accelerates above 40C. Here is the material-by-material answer for every common bottle.
Plastic bottle safety depends on the plastic type. PET leaches antimony in heat, polycarbonate has BPA, most BPA-free plastics have untested EA activity.
Tournament cricket means 2-3 games per day. Cumulative dehydration compounds and 45 minutes between games is not enough to rehydrate. Here's the protocol.