My son has this thing with water and lemon. He loves lemon in his water. He loves to go out to eat so that he can order a "water with lemon". The child drinks no soda but he will down a gallon of water, if it has lemons.
The reason he likes to order this when we go out is because I rarely have lemons around the house. If I do, I bought them for a specific purpose and they don't ever make it to his water. The last time we went grocery shopping he graced me with his presence and asked for some lemons for his water. I agreed and bought two.
This is what we did with them.
Take clean ice cube trays. I say clean because our hasn't been used since we bought our fridge six years ago and they were gross!
I halved, then quartered, then eighth'd my lemons. Cut each wedge in half. I also cut the white tips off each wedge and they fit perfectly.
If I do it again:
Someday I will find a silicone muffin pan at a garage sale nice and cheap! I will buy it and then do slices of lemons on the round side. Won't that be pretty!?!?