Fence posts; can we pour the dry concrete mix in the hole and add water, mixing it around with a stick?

I used quick setting concrete mix and used an old wheelbarrow. Mixed and poured (easy for a 1 person job) from the wheelbarrow, hosed it clean when finished. Its not back breaking work...

There are some brands of concrete that will work this way. I would recommend using ordinary Sacrete mix. Make a small batch in a 5 gallon bucket and pour into the hole around the post. Mix only a third of the bag at a time. Make sure that there are no dry spots left in the mix.

HELL NO! been there and done that, the concrete does not get mixed Oh and sono tubes (concrete tubes) are not for putting in the ground, they are for raising a footing out of the ground. If you are pouring footings flush to grade or sub surface grade you do not need sono tubes. Using sono tubes the full length under ground completely waists the integrity of the purpose of footings. Concrete poured in the ground fills all the imperfections and basically wedges itself in the ground. If you were to use a sono tube you will have essentially have just buried a concrete column that will sit in the hole loosely. My suggestion to you is have a neighbor that has done this before come over for a "BEER" wink wink.

no its fine but you dont have to concrete them at all just put the dirt out of the holes in around the posts and tamp it in Ive done this in the past and fence still standing doing this saves you time and money

you can pour it in dry (quikrete) and if the moisture from the ground and future rain will harden it in a week or so. depending on where you live. I've done it alot.