When first trying to get into macrophotography with my beginner gear I had real trouble trying to get enough light. This led me to the idea of using ice cubes in my bourbon as targets as I could shoot right through them and directly into my light source. I've finally obtained a flash and diffuser kit so my range of subjects is expanding, but these shots have kind of become my specialty for now.
Hand held shot with a Canon 250D with the 18-55 kit lens set at 18 with 36mm of extension tube, f16, 1/400. Light source is a lume cube panel mini from the side, and some of the texture on the bubble is a reflection of a shiny piece of construction paper underneath. Bourbon is a little extra red due to the addition of a few splashes of bitters