@Jaypro I had ACL reconstruction and meniscus repair 10 years ago. Recovery time depends on your level of fitness and age, however I would say less than 6 month before water time could mean risk.
The ACL repair came a long way they place the graft is less vertical improving knee stability.
2 Key things from my experience is getting as much movement before surgery. If you can't bend your knee fully before surgery, it is unlikely you will have full movement after if ever.
The second is PT. Don't wait. The day after surgery as much as possible will make a massive difference. There are plenty of PT exercices that you can do including stationary bike...
Finally get a brace for when going back to the water. this is not for support but for preventing knee rotation to the point of re-injury. It is also great for confidence. Common brands are DonJoy, Breg, CTi.