Beyond those obvious things, there are other solutions like making a DIY slow irrigation system out of old plastic bottles so you don't have to remember to water as much. (treehugger.com)
Similar to this green way of drinking (old bottles, fresh wine), Scott in the States sells new liquid soap packaged in old plastic bottles. (treehugger.com)
In fact, it's been noted that constant sterilization via boiling can cause older plastic bottles to leach out BPA quicker. (verywellfamily.com)