Daily pumped bottle help needed

I am struggling to find information on how to give a daily bottle of pumped breast milk. I would like to do this so baby gets used to the bottle and can be given if I am out at other times occasionally.

If I pump in the morning is that milk okay to give my baby at night?

Or do I only pump in morning once to create the first bottle and then move to pumping at night when bottle is given instead? My supply is greatest in the morning… ideally I only want to pump once a day as this is just for teaching my baby so I have the option of the bottle for future needs.

Thank you for any tips and help!!