the farmed land or the place that you put your seed in wating for wheat you can plant seeds in it and get it will grow up without water but really slow you need about 3 game days for get growing up to the max level so that shouldn't happen because farmed land must be working with water
without BoneMeal
and thank youi
Wheat does not need water to grow, and in fact farmland will not revert to dirt from dehydration while a wheat crop is planted on it. However, wheat grows significantly faster on hydrated farmland. Also, in Biomes where Ice can be formed naturally, it is recommended to keep the farming area well-lit or underground to prevent growth reduction because of dehydration.