Small kitten (maybe 2 months) needs a home urgently – 23 August 2014

Somebody left a small kitten (maybe 2 months) in a nearby field with a heavy collar around his neck so that he could not escape. After I managed to rescue the kitten I gave him shelter but the problem is that I can not keep it because I already have one and to put him back on the street it will be his death sentence for sure. Please can you tell me what to do?

Thank you