We're making a fire pit. There seems to be a lot of redundant and somewhat unclear advice on the web for making one. We dug about a foot into the ground, and it has about 4 ft diameter. Our ground is very sandy and drains well so we're planning to leave the base as just that. What I can't find on the web is the WHYS of using brick or rock, and when a liner is or isn't needed. And whether to mortar or just stack. I wanted this to be simple - like a campfire. But I know it's wise to build something that lasts and works well too. Do I just stack wedge shaped bricks I can get at a home depot garden section around it and call it good or do I need to get special bricks, liners etc. I don't think we'll be using it to death - just occasional fun use and maybe even get a grate and do some bbq if we desire once in awhile. Thank you so much for your time and thoughts.