Update MyCustom.cfg

* Changed Hydration to 30 (similar to waterbotle)
* Changed Temperatur Cap (Cold = 32°C / Hot = 42°C) Beware of Heatstroke and Hypothermia!
* Changed Effect Temperature (Normal -0,1°C | Cold -0,5°C | Hot +0,5°C)
* Info: Gregtech Drinks don't get Hydration/Temperature effect. ToDo: Talk with Grandfather GregoriusT

Thanks to Butze for the tips about Cap