浓
=
农
+
氵
:
Nelson Newt (nu) is watering his monoculture (农) in the engine's kitchen ((e)ng2). He added a lot of fertilizer to the water in his water bottle (氵) and as he empties the bottle a thick (浓) fog with a strong (浓) smell is emerging from the liquid.
insipid / diluted / weak / mild / light in color / tasteless / indifferent / (variant of 氮[dan4]) nitrogen
淡
=
氵
+
炎
:
Don Quixote (d) found out that the water in the anthill's bathroom (an4) is potable (淡), so he instantly started making dumplings and to fill the water in a lot of water bottles (氵). Now he is laying in one corner having the itis (炎) since he ate and drunk too much.