Lowes >>>>>>> Home Depot when it came to doing mine.
I got plastic/rubber washers for both sides, aquarium silicon, plumbers tape. All the fittings I got were near the PVC area in the back and in the sprinkler area. Hard to fully explain what I bought but just browse around till you find something that fits well. If you aren't on a huge time crunch, I would suggest just going to htgsupply.com or some other hydro store online and just buy the premade attachments they have. Way easier. Plus you can get other items if you need.