I haven't seen that exact type of bottle.
However, 20 litre/5 USG "water cooler" jugs are widely available.
1. Contact a
local bottled water company. They probably cycle bottles in and out on a regular basis. They may insist on drilling a couple of small holes for liability and reputation reasons, since their logo is on the bottle.
2. Put up a notice at the local bottle recycling depot. Some of the bottles I see, a bit smaller than 5 USG, come from grocery stores with a 25 cent deposit added. If people know what you're doing, they may
sell them to you instead.
3. My method: get to know the guy who runs the recycling facility in a smaller town. People throw the big water bottles in the recycling bin, but most are no longer accepted, so he fishes them out. Instead of throwing them in the dumpster, he sets them aside for me.
Note: I also wrap up a couple of beers on occasion and slip them to him discreetly, in appreciation, to keep the wheels of goodwill rolling smoothly. Women say thanks with
cards. Men say thanks with beer.