You can do 'Tank Transfer Method' with 5g buckets. You would need at the minimum 2 buckets n 2 heaters. Get disposable air stones so you can just throw them away instead of having to sanitize them.
When you buy the fish, match salinity to the water it is in. Before placing in 1st bucket, do a formalin dip. Then into 1st bucket. Bucket should have a heater n an air stone with pump.
Before 72hrs is up, transfer to 2nd bucket. Also with heater n air stone n pump. You dose Parizipro
Sanitize the 1st bucket n heater with mild bleach solution then air dry for at least 24hrs.
Before next 72 hrs is up, transfer to back into 1st bucket. 2nd dose of parizipro in this bucket.
Before 72 hrs, transfer to bk to 2nd bucket after it has been sanitized and air dried.
You can do a 5th transfer if you'd like, esp if any of the transfer were short.
You should research TTM. There are a few caveats.
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