Honestly, your best bet is to just use the acriflavine powder as needed. If you were needing to give a fish a bath, fill a 5 gallon bucket with SW and dose 200mg of the powder. It will dissolve in just a few minutes, so long as you provide ample circulation, and then you are good to go. Can you get digital scales like the ones below in India?
http://www.amazon.com/American-Weigh-GEMINI-20-Portable-MilliGram/dp/B0012TDNAM
http://www.amazon.com/American-Weigh-Scales-Digital-BL-1KG-BLK/dp/B0012N1NAA
Miligram Digi scales are costing 350$ here.. chineese are available but not reliable..
Check this,
http://www.versaquatics.com/treatmentandmethodology.htm
This is what i found from the above site
Acriflavin (Trypaflavin)
Use: Skin turbidity or clouding, mouth rot, fin rot, and disinfection of small wounds.
Spectrum of Action: Costia spp., Chilodonella spp., Trichodina spp., Trichodinella spp., flexibacteria, fin and skin turbidity or cloudiness.
Both names refer to the same drub. It dyes intensely. Acriflavin can be put into the completely set up aquarium but severely damages plants. The filter substrate should be cleaned before addition of the drug. After the treatment, filter over activated charcoal to remove the drug.
Stock Solution: 1 g to 1 liter of water.
Dosage A: 1 ml stock solution to each liter of aquarium water to prevent infections.
Dosage B: 3 ml stock solution to each liter of water for four days to help against infections in the early stage.
Dosage C: 5 ml stock solutions to each liter water in a separate container for two to four days against Columnaris spp., Costia spp., Trichodina spp., and Chilodonella spp.
Dosage D: 10 ml stock solution to each liter water in a separate container for 20 days ( against Ichthyophthirius spp.) or for 10 days (against Oodinium spp.). Caution: Many fish do not tolerate this dosag