Are you hoping to do multiple plants in one bucket, or multiple plants in multiple buckets?

If you hope to use 1 bucket/plant, these might be more convenient (no need to drill a hole, but they do use more hydroton)

https://www.amazon.com/Bucket-Basket-inch-single-basket/dp/B00CO7BBSW/ref=sr_1_4?dchild=1&keywords=net+pots+bucket&qid=1586717085&sr=8-4

If you're hoping on having multiple plants in just the one bucket, you could use the 2 outlet version of your airpump (but it's only a few dollars cheaper, so maybe it's not worth it).

https://www.amazon.com/Hydrofarm-Active-Aqua-Pump-Outlets/dp/B002TCC46U/ref=sr_1_2?dchild=1&keywords=hydrofarm+2+outlet&qid=1586717282&sr=8-2

I have this one from Amazon but when I got it less than a year ago it was only $16, now listed at $25. So to give you an idea of price, look for something $15 or so. This one would be great for one bucket and good for 2 or a recirculating system if you upgrade. I use it still on my 16 gallon (2x 5 gal bucket) RDWC system

Here's a very good pump

Here's the best airstones I've ever seen/used

Here it all is in action (scroll half way)