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Although you should not mix zerex antifreeze, if you already have, simply draining it and refilling with proper mixture antifreeze will solve this problem. You should not have any problems long term from this, and thermostat should be fine. Short term problem is mainly lowering the boiling point which can lead to overheating easier.
Replace the hose that is leaking, drain and refill with proper antifreeze, and you will be good to go.
If you want to change out the thermostat as a precaution, yes you can use regular sockets.
Either the thermostat is stuck, which usually will cause it to run hot, the end of the housing is cracked, or there is some corrosion on the housing and the hose is no longer getting a good seal. You will need to pull the hose to insect the last two, and pull the housing to inspect the T-stat.
Yes, you can run it for a week without the thermostat, but you may set a fault code because the engine is not getting up to proper operating temperature. But this will reset itself after the new thermostat is installed.
You can get zerex that is 100% antifreeze, or opt to pay slightly more for the 50/50 mix, which is easier as you get the perfect mixture.