the density of the water can change independent of the weight and volume of the sugar addition- this is because the water molecules stay closer together on average when you dissolve something else in them- otherwise gravity would get lower as you added sugar because the water molecules would be...
just do 2 5 gallon batches at once and taste it before you bottle. if it's infected or totally messed up you can pour it out and start over. if you do extract kits and follow instructions reasonably well you are likely to get good results unless you let it get oxidized or something
yes. if you know the liquid volume and weight you can calculate the specific gravity. If you have a second identical bucket and fill it to the exact same level with water, then measure how much water that is you have the volume. To get specific gravity weigh the full water bucket then the full...
Spring water is often used because it is filtered in the ground in the process of getting to the surface.
Lake water has a high potential to be microbiologically unsafe because fish and other things live in there and it must be boiled. Does it taste good to start with?
measure gravity as soon as active fermentation begins and my bet is it will be higher once the yeast mixes the wort.
adding a tad more won't hurt anything but i wouldn't go too far or you may get outside the style
if you have concerns you can add some extra hops to your boil like 1/3 of what you would usually use for 5 gallons of unhopped extract- i think diminishing hop flavor is the main reason for having a pull date at all, extract should have a loooooong shelf life otherwise
softened water just has a small amount of salt in it, usually potassium to help reduce the calcium level. If it's safe to drink it should be fine for cleaning. Hit the grocery store for some filtered bottled water to brew with though it's probably worth the $6.
it should mellow over time, yes. the flavor might be way out of whack if you tasted it before fermenting it too because of other grain flavors in the wort that will change during fermentation. Hop flavor diminishes over time too. the recipes are balanced so they taste right after not before...
2. I don't think peanut butter has a flavor as delicate as honey that changes when boiled. It's used in hard candy and stuff and that is even hotter than boiling.
3. EC-1118 is excellent for going very way dry if that is your goal. Might go below 1.000. It takes anything resembling a sugar...