“Do they max out their credit cards and go into debt or do they save their money?”
Although Keynesian economics (which is associated with liberals but has long been supported by many conservatives as well in practice) advocates economic stimulus even it increases the national debt, but that does not mean that it also advocates individuals maxing out their credit cards. So there would be no reason for liberals to take out lots of debt to be in line with their beliefs.
“Would they allow their children to do something illegal and then fight to legalize that action?”
What are you talking about? Marijuana? I think most liberals would not allow their kids to use it, even if they advocate making it legal (many conservatives also advocate legalization as well). I was disappointed, however, with President Obama’s recent remarks saying that marijuana is no worse than alcohol and saying that he would tell his children just that it’s a vice and a waste of time (rather than warning them against in stronger terms).
“Would they buy a more expensive item which they can’t afford but is good for the environment or buy a more affordable item that’s not good for the environment?”
Yes. Organic and other more-expensive-but-environmentally-friendly products are a multi-billion dollar industry in the US (and in Israel too, where organic food is also popular in the religious sector), which I’m sure conservatives contribute to too, but certainly many liberals are the ones buying these products.