You technophobes have absolutely no idea of the power of technology in situations like this. Remember the USA is the home of the great Apple Corp and That nice Mr Musk's self driving cars. So the answer to your dunka"bill"ity (Ha ,ha. See what I did there?) is a particularly high tech one...........the insulated Tim Horton's cup has a lid that you can take off. How bloody clever is that?
Other opinions may be available but this one is always correct.