There are many methods of feeding live female butterflies.  Here is a setup where I took honey and water and mixed 1:10.  Next. I poured the honey water onto paper towels.  Then I placed the female over the moisture, uncoiled her proboscis into the moisture and let her drink. 

Most species of butterflies do not require that you place force her proboscis into the water; once their feet sense moisture, they nectar.