Let us know if it shows anything. There are other testing kits, but after reading a lot of negative feed back, I don’t recommend them any more. This sort of thing is really needed.
If giardia is a problem in your water, then you can get metronidazole. (Aqua Zole sold online.) That sounds like Aquasol which is a wormer, but Aqua Zole or Fish Zole is the generic anti-Protozoa drug metronidazole. Dosage for poultry is 50 mg per pound given orally daily for 5 days. Have you...
Have you asked your regular vet if you could just bring in a sample of droppings, and treat it like one of your dogs or cats, to do a fecal float? Do any of your animals need a check up or yearly shots? My vet would do that for me. I would get a diagnosis before treating for giardia...