I have just finished cooking 3 boneless chicken breast fillets (in a closed casserole dish). Out of curiosity, I weighed them before and after cooking. Weight before cooking was 512 grams. Afterwards 355 grams. Weight loss was 157 grams or just over 30 percent of the original weight. I am assuming that the fluid "lost" is water. Cost of the fillets was £3.94. At 30 percent water I have paid £1.18 for 157 grams of water. 157 grams of pure water has volume 157 cc or .157 litres. I reckon that that is about £7.50 for a litre of water from my butcher! Good value, eh?
Actually, that surprises me from a butcher
You expect some water but from a butcher not that much - was it a proper butcher or a supermarket butcher or a chain store delicatessen that says they are a butcher?
but now you have to go find a live chicken cut 512 boneless grams off it (maybe kill it first) and subject to the same cooking etc to find out if the water was naturally present or pumped in