You can pull some cool stuff from turn of the century dumps, it takes a lot of digging common ones till you hit something good though. I toss away so many mayo and ketchup jars, they must be about 50-1...50 commons to one rare one. Found a rare double sided porcelain Copenhagen Snuff sign from about 1915 in a 20's-40's dump, both sides are nice too.
If all you are finding are small privies that date from the 20's I think you should try and find a dump to dig, much more variety than a turn of the century privy used by one family. You will usually find them on the sides of large hills leading down to a river.
The large textured bottle you showed is an ammonia bottle most likely and have little to no value.
The most common thing with value for me to find in 20's-40's are milk bottles. The ones that have no scratching or case wear are highly collectible. I keep all the perfect ones I find for my own collection. I never sell the minty ones because they are few and far between, you can dig scratched and stained ones all day in a nice sized dump but finding them without scratching and case wear is very uncommon. Out of about every 20 milk bottles I find maybe 3 of them will be relatively wear free and have no staining.
