Billies

Who here uses a billy? Is there a secret to them?
I have 2 small tin ones I purchased at different establishments, both of which started rusting before I got home from the first walk i took them on. (neither of which went for a swim with me last walk...so its only from cooking use that they get wet
)
Are aluminum billies better? Is alzheimers a concern?
Is titanium worth the expense? what is its heat transfer like?
I have 2 small tin ones I purchased at different establishments, both of which started rusting before I got home from the first walk i took them on. (neither of which went for a swim with me last walk...so its only from cooking use that they get wet

Are aluminum billies better? Is alzheimers a concern?

Is titanium worth the expense? what is its heat transfer like?