Not all plastic items are safe to re-use!

That's why the best way to help the environment would be to use water bottles that are made of materials that will last a "lifetime" like stainless flasks and BPA-FREE bottles that are meant to withstand daily usage without leaking chemicals into your beverage or food containers.

Based on research, the following numbers (you usually find these numbers below the container) are safe to re-use:

#2 HDPE (High Density Polyethelyne) - safest, especially when content is liquid

#4 LDPE (Low Density Polyethelyne)

#5 (Polypropelyne)

So what do you do with bottles labeled outside of the safe numbered ones?

There are so many cool ideas on the internet actually! (Images below courtesy of google)

Perfect for Flood-prone Manila

Some washers and bolts and an old rod does the trick

Saves money in buying clay pots

Themed containers for different occasions

More earth-friendly ways to save

Those caps are also useful, look at this nice art installation!

There are lots more ideas online. Get a little creative, it does so much good for the earth and makes you even more productive as well!

Cheers!