You cannot use tools for no reason in Innocent Life Futuristic Harvest Moon, but you exploit the system and use tools after certain tasks or activities are done.For the watering can, simply till a square of soil and you can water that square once with the can. Note that the item ''strange moss'' prevents you from watering the affected square daily, so use this exploit on squares that are virgin. As for the hammer and hoe, there is an exploit that lets you use them on a single square so long as your character has PP to spare. Use the hoe to till a square, then use the hammer to ''untill'' the square. Go back to using the hoe and repeat. All this can be repeated so long as you want to expend PP.
As soon as you buy any animal from the World Ranch, you can go to Jonathan and talk to him to acquire the next Robot Animal Helper. The animal you bought does not need to have been delivered to the farm yet. However, Jonathan will assume that you already have the animal in use and will tell you that he will send the next type of Automatic Animal, unlocking the option to buy that type of animal from the World Farm.
After the doctor gives you your robot, make it take care of your crops and field for you while you are looking for wild things to collect. When your scale pack gets full, buy as many seeds as possible and plant them all. Harvest your plants when ready. When done, put all of the contents in your scale pack in the shipping pod with the harvested crop to end up with a large sum of money.