Either attach something heavy to the ice, or play with the density of the water, or of the ice (adding something to it).
anything denser than the water will sink in it.
An egg will sink in water but will float in salt water. An egg will sink faster in hot water than it will in cold water.
As long as the feather stays all by itself, it will never sink in water, because its density is much less than the density of water. If you really need to sink it, then you must tie it to something much more dense, like a rock or a fishing sinker.
Most fruit is heavier in water and will sink. Lighter fruits such as cherries and citrus slices will float. To make them sink, they could be frozen to make them heavier. They will eventually become waterlogged and sink.
Weigh the item down or find a way to fill it with water. For it to sink it must have a greater mass than the liquid it is placed in.
Bathroom sink use 5 liters of water.
97% will sink below the water
Pour the water out
Objects sink or float depending on their Mass and density. If the object has a Density LOWER than water, it will float. Higher than water will sink. You can find density by multiplying its Mass times its Volume, there you have its density. Water has a Density of 1, things with lower may sink, only slightly if there isn't much difference.
Paper will sink once it has absorbed enough water to make it heavy.
put water in it
Yes, it may make oil sink if at some temperature the density of water goes lesser than that of oil.