Ash Gourd

What is the alternative of ash gourd as we can’t find it in our area?
Can we have ash gourd juice if we are trying to conceive or pregnant?
Can we have ash gourd juice if we are suffering from sinus or asthma?
Can we have ash gourd juice if we are suffering from thyroid imbalance?
Can we store the ash gourd juice in the fridge?
For how many days are we supposed to take ash gourd juice?
Can we have it at any other time? In the evening?
Can we have ash gourd juice if we have a cold?
Can ash gourd juice be consumed in a cold place or cold weather?