In response to the question about refilling the zip-lock bags: No, we
don't even try; we consider them expendable. I buy the institutional size
pack of bags from Sam's Warehouse (200 bags).
  I make up my syrup at the house and fill 1 gal jugs and fill the
zip-locks on site. Had too many problems with the bags leaking while
travelling on bumpy roads to the out-apiaries.
   Try hefting the colony to guage amount of stores and feed all the
light ones. Need to make several trips with the bags, though, not enough
to do one time.
   Jerry
 
Gerard P.Worrell Beekeeper with 25 colonies
(410)257-3267  Dunkirk,MD USA
Pres. Assoc. of Southern MD Beekeepers
Life member MD State Beekeepers Association,VP for Calvert Co.