I've been running hempies for a few years now. I'll be glad to offer advice (no promises) but I need to know more about your setup. Home depot sells food grade white 5 gallon buckets. They're about $5
https://www.homedepot.com/p/Leaktite-5-gal-70mil-Food-Safe-Bucket-White-005GFSWH020/300197644. I suggest you get some for your next grow.
If you're using perlite, you probably have the super dusty small stuff. See if you can get some the big chunk type
https://www.amazon.com/Fox-Farm-FX14044-4-Cubic-FoxFarm/dp/B003H7IY38 to use as a medium. You can probably find better pricing if you look.
For a 5 gallon bucket, drill your drain hole about 2 1/2" up from the bottom. I use 1/2 inch pvc to make small 90 degree drain pipe so I drain from the bottom rather than the new nutes coming in. PM me if you want specifics.
I have a 55 gallon drum I use to condition town water for a couple of days before I use it. In a separate container I usually mix up about 35 gallons of nutrients at a time. Just stir it up real well before you feed (electric drill with a plaster mixer). You'll need to do a little plumbing to work a system like this but it makes life a lot easier.