MOst fish are ok if the temp doesn't go below 20 or so, its pretty warm this time of year, i recon your biggest problem will be having enough water and keeping the water cleanish, without a filter. Don't forget most fish are imported and transported packed into little bags, it must take at least 3-4 days for them to be packed, taken to plane, flown, customs, distrubter, retailer. Also I understand that when transported they use pure oxygen in the bags.