There are those who would prefer not to use PVC pipe or vinyl tubing when making sub-irrigation planters (SIPs aka “self-watering”).
Recycled water/juice bottles are an environmentally friendly alternative. It's very easy to make fill pipes from recycled water bottles and help the environment by keeping them out of our landfills.
Simply cut off the bottom with a box cutter and stack them for any length fill tube. Small bottles of the one pint + size take up the least room inside the SIP.
I would encourage everyone to use this method. It's practical, cost effective and green.