Quikrete didn't absorb much water. What did I do wrong?
Bagged concrete dumped in hole dry can work but is not ideal. With a clay base the hole is like a pipe. Adding water to the top the mixture will absorb water a few inches down then create a seal. It may be possible to get the mixture wet by heavily soaking the area for a week or more. Moving the post may allow water to penetrate deeper at the cost of creating clumps around the post not the solid mass you want. Winter rains and the higher ground water water level may help. If you would like to use your hammock next week pull the post clean out the hole knock the clumps off the wood and put the post back in the hole. Now there are 2 options. Mix the fresh bag's of quickcrete in a wheelbarrow and fill the hole or put some water in the hole add quickcrete , water more quickcrete water... You get the idea two much water will make it weak but stronger than the original no water in the hole mix.